CILENGITIDE

IUPAC Condensed	cyclo[Arg-Gly-Asp-D-Phe-N(Me)Val]
HELM	PEPTIDE1{R.G.D.[dF].[meV]}$PEPTIDE1,PEPTIDE1,5:R2-1:R1$$$
IUPAC	cyclo[L-arginyl-glycyl-L-alpha-aspartyl-D-phenylalanyl-N-methyl-L-valyl]

CILENGITIDE

• Molecular FormulaC₂₇H₄₀N₈O₇
• Average mass588.656 Da

2-[(2S,5R,8S,11S)-5-benzyl-11-[3-(diaminomethylideneamino)propyl]-7-methyl-3,6,9,12,15-pentaoxo-8-propan-2-yl-1,4,7,10,13-pentazacyclopentadec-2-yl]acetic acid

Cilengitide has been in phase III clinical trials by Merck Serono and NCI for the treatment of glioblastoma multiforme. However, this research has been discontinued.

Cilengitide was originally developed by Merck KGaA in collaboration with the Technical University of Munich, then received orphan drug designation from FDA for the treatment of glioma in 2005.

Cilengitide (EMD 121974) is a molecule designed and synthesized at the Technical University Munich in collaboration with Merck KGaA in Darmstadt. It is based on the cyclic peptide cyclo(-RGDfV-), which is selective for α_v integrins, which are important in angiogenesis (forming new blood vessels), and other aspects of tumor biology. Hence, it is under investigation for the treatment of glioblastoma, where it may act by inhibiting angiogenesis, and influencing tumor invasion and proliferation.^[1][2]

The European Medicines Agency has granted cilengitide orphan drug status.^[3]

Cilengitide seems to function by inhibiting the FAK/src/AKT pathway and inducing apoptosis in endothelial cells.^[4] Preclinical studies in mice of cilengitide were able to demonstrate efficacious tumor regression.^[4]

In a rat xenograft model, cilengitide was able to potentiate the cytotoxic effects of radiation when cilengitide was administered prior to radiation therapy.^[5] When combined with radiation, inhibition of integrin expression by cilengitide synergistically improves the cytotoxic effects of ionizing radiation for glioblastoma.^[5]

Clinical trials

Phase II studies were able to demonstrate that cilengitide as a potential monotherapy in patients with recurrent glioblastoma^[6] with high intratumor drug levels when 2000 mg of cilengitide is given twice weekly.^[7]

Cilengitide is well tolerated, in combination with radiation and temozolomide, at a dose of 2000 mg in patients with newly diagnosed glioblastoma, regardless of MGMT promoter status.^[8] In a phase I/IIa study, the addition of cilengitide to the standard of care for newly diagnosed glioblastoma (surgical resection followed by temozolomide and radiation therapy) improves progression-free survival and overall survival in patients with MGMT promoter methylation.^[9]

However, in a subsequent study, cilengitide does not seem to alter the pattern of glioblastoma progression,^[10]

and in an EORTC phase III randomized, controlled, multicenter clinical trial, consisting of over 500 patients in 23 countries, the addition of cilengitide to the standard of care did not improve overall survival in patients with newly diagnosed glioblastoma and methylated MGMT promoter status ^[11] A phase II study, the CORE trial, is currently being conducted in patients with newly diagnosed glioblastoma and unmethylated MGMT promoter status.^[12]

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SYN

Angewandte Chemie, International Edition, 55(4), 1540-1543; 2016

SYN

Chemistry – A European Journal, 16(18), 5385-5390, S5385/1-S5385/36; 2010

Route 2

Reference：1. CN102731627A.

EMD121974 (Cilengitide), the Chinese another name: ring (L-arginyl glycyl-L-aspartoyl-D-phenylalanyl-N-methyl-L-valyl) is an a kind of new classification cancer therapy drug of synthetic.Merkel company discovers that EMD121974 amalgamation radiotherapy (merging to reach assists TM to add radiotherapy) possibly prolong lifetime; Simultaneously integrate plain supressor antitumor drug as first; Got into the III clinical trial phase, its important mechanism is to grow targeting that the blood supply structure of nutrition, the growth of promotion cancer cell is provided in tumour and for tumour through line artery.

The EMD121974 molecular formula is: C ₂₇H ₄₀N ₈O ₇, have following structure:

The preparation method of cyclic peptide mainly contains liquid phase synthesis process, solid phase synthesis precursor peptide cyclization process, process for solid phase synthesis in liquid phase at present; Wherein preceding two kinds of synthesis techniques all are the cyclisation in liquid phase of synthetic precursor peptide, and this method needs reactant in extremely rare solvent, to react (10 ^-3～10 ^-4Mol/L), and intermolecular be prone to react generation line style or cyclic polymer, greatly reduced the cyclisation yield, bring trouble for follow-up purifying, and in large-scale production, produce a large amount of waste liquids, be unfavorable for suitability for industrialized production.In conjunction with the structure of EMD121974, utilize the false rare principle of benefit of solid phase, developed a kind of efficient cyclization reaction, the cyclisation time shortens to 20%～30% of liquid phase cyclisation, and the 2%-8% of solvent as liquid phase used in reaction.

Embodiment 1

The preparation of Fmoc-L-Asp (OtBu)-Wang Resin

The Wang Resin that takes by weighing the 10g substitution degree and be 0.5mmol/g joins in the reactor drum, adds an amount of DCM, and swelling 30min takes out DCM; 6.17g Fmoc-L-Asp-OtBu, DIC 2.40ml, HOBT2.1g are dissolved among the 30ml DMF; At 0-5 ℃ of activation 15min, activation solution is joined in the reactor drum that contains Wang Resin, behind the reaction 10min; Add DMAP 0.18g again, at 0～30 ℃ of reaction 1～5h.After reaction finishes, add sealing Wang Resin unreacted hydroxylation reagent diacetyl oxide 1ml and pyridine 0.5ml, behind the capping 1h, DMF, DCM, the CH of 80ml used in washing successively ₃OH, DMF washing 2,1,1,2 times, each 1min.Through detecting, obtain the Fmoc-L-Asp that substitution degree is 0.47mmol/g (OtBu)-Wang Resin.

Embodiment 2

The EMD121974 precursor:

The preparation of A-Wang Resin (Fmoc-D-Phe-N-Me-L-Val-L-Arg (Mtr)-Gly-L-Asp (OtBu)-Wang Resin)

Fmoc-L-Asp (OtBu)-Wang Resin is joined in the reactor drum, behind DMF swelling 30min, take out solvent, the piperidines-DMF that adds 80ml 25% reacts 5min, and 80ml DMF washs 1 time (3min), and the piperidines-DMF that adds 80ml 25% reacts 15min; DMF, DCM, the CH of 80ml used in washing successively ₃OH, DMF washing 2,1,1,2 times, each 1min; With 4.45g Fmoc-Gly-OH, 5.68g HBTU, 2.03g HOBt, be dissolved among the DMF of 30ml, dissolve the back and added DIEA 2.45ml; 0～5 ℃ of activation 15min; Activation solution is joined in the above-mentioned reactor drum, and behind reaction 1-3h under 0～30 ℃, reaction end detects with ninhydrin method.Adopt aforesaid method coupling Fmoc-L-Arg (Mtr)-OH, Fmoc-N-Me-L-Val, Fmoc-D-Phe-OH successively, finally obtain Fmoc-D-Phe-N-Me-L-Val-L-Arg (Mtr)-Gly-L-Asp (OtBu)-Wang Resin.

Embodiment 3

EMD121974 precursor peptide: the preparation of B-Wang Resin (D-Phe-N-Me-L-Val-L-Arg (Mtr)-Gly-L-Asp-Wang Resin)

With volume ratio is that piperidines-DMF of 25% is the Fmoc deprotection agent of Fmoc-D-Phe-N-Me-L-Val-L-Arg (Mtr)-Gly-L-Asp (OtBu)-Wang Resin; Add piperidines-DMF 80ml of 25% first time; Reaction 5min, 80ml DMF washs 1 time (3min), adds piperidines-DMF 80ml of 25% for the second time; Behind the reaction 15min, DMF, DCM, the CH of 80ml used in washing successively ₃OH, DMF washing 2,1,1,2 times, each 1min gets D-Phe-N-Me-L-Val-L-Arg (Mtr)-Gly-L-Asp (OtBu)-Wang Resin after washing finishes.

80% the PhOH-DCM solution that adds volume ratio and be 100ml takes off OtBu with the TFA of catalytic amount, reacts 8h; DMF, DCM, the CH of 80ml used in washing successively ₃OH, DMF washing 2,1,1,2 times, each 1min gets D-Phe-N-Me-L-Val-L-Arg (Mtr)-Gly-L-Asp-Wang Resin.

Embodiment 4

The preparation of EMD121974-Wang Resin (Cyclo (D-Phe-N-Me-L-Val-L-Arg-Gly-L-Asp)-Wang Rsin)

In above-mentioned reactor drum, add cyclization reagent 3.9g DPPA, 2.5ml DIEA (reactant cyclization reagent amount of substance ratio is 1: 3), at 10～40 ℃ of reaction 3h, the multiple cyclization reagent reaction 3～5h (reaction end detects with ninhydrin method) that throws once above-mentioned equivalent; DMF, DCM, the CH of 80ml used in washing successively ₃OH washing 2,1,3 times, each 3min gets Cyclo (D-Phe-N-Me-L-Val-L-Arg-Gly-L-Asp)-Wang Rsin.

Embodiment 5

The preparation of EMD121974 (Cyclo (D-Phe-N-Me-L-Val-L-Arg-Gly-L-Asp))

In above-mentioned reactor drum, add the TFA/H of lytic reagent 120ml again ₂Behind O/TlS (volume ratio is 95: 2.5: 2.5) the reaction 3h, suction filtration is removed resin, and filtrating slowly joins in the no water-ice ether; Static 2-5h, high speed centrifugation obtain thick peptide, prepare through high-pressure liquid phase; Lyophilize gets smart EMD121974; Its purity＞99.5%, single impurity＜0.2%, total recovery reaches 63%.

Choosing substitution degree in the present embodiment is the Wang Resin of 0.5mmol/g, and can also choose substitution degree is the arbitrary Wang Resin and Fmoc-L-Asp-OtBu prepared in reaction Fmoc-L-Asp (the OtBu)-Wang Resin of 0.4～0.9mmol/g scope.All can realize technical scheme of the present invention, and obtain technique effect of the present invention.

Above content is an EMD121974 and become one of best preferred version of route; And to further explain that the present invention did; But can not assert that practical implementation of the present invention is only limited to these explanations; Under the prerequisite that does not break away from the present invention’s design, can also make some simple deductions and replacement, all should be regarded as protection domain of the present invention.

CLIP

https://www.eurekaselect.net/article/2607

Cilengitide, a cyclic RGD pentapeptide, is currently in clinical phase III for treatment of glioblastomas and in phase II for several other tumors. This drug is the first anti-angiogenic small molecule targeting the integrins αvβ3, αvβ5 and α5β1. It was developed by us in the early 90s by a novel procedure, the spatial screening. This strategy resulted in c(RGDfV), the first superactive αvβ3 inhibitor (100 to 1000 times increased activity over the linear reference peptides), which in addition exhibited high selectivity against the platelet receptor αIIbβ3. This cyclic peptide was later modified by N-methylation of one peptide bond to yield an even greater antagonistic activity in c(RGDf(NMe)V). This peptide was then dubbed Cilengitide and is currently developed as drug by the company Merck-Serono (Germany). This article describes the chemical development of Cilengitide, the biochemical background of its activity and a short review about the present clinical trials. The positive anti-angiogenic effects in cancer treatment can be further increased by combination with “classical” anti-cancer therapies. Several clinical trials in this direction are under investigation.

CLIP

Journal of Protein Chemistry

Schematic of the one-step chemoenzymatic synthesis of cilengitide using wild-type Mcy TE. (1) The chemically synthesised (SPPS, solid-phase peptide synthesis) mimetic substrate was condensed with benzyl mercaptane to produce pentapeptide thioester (pentapeptide-BMT). (2) Models of the substrate-O-TE acyl enzyme intermediate are marked with brackets (protein data bank, 1JMK). (3) Mechanism of TE domain catalysis: a pentapeptide -O-TE acyl-enzyme intermediate is formed by transfer of the peptidyl chain from the phosphopantethiene of the terminal peptidyl carrier protein (PCP), which was substituted by benzyl mercaptane, to the active site serine of the TE domain. For hydrolyzing TE domains, the intermediate is captured by water, generating the linear peptide; for cyclizing TE domains, an intramolecular nucleophile captures the intermediate, resulting in “cilengitide”

PATENT

WO 9745447

WO 9745137

DE 19534177

WO 2000053627

WO 2000047228

US 20040063790

WO 2009124754

WO 2011079015

 WO 2011069629

 WO 2011144756

WO 2016059622

PATENT

WO 2012062777

https://patents.google.com/patent/WO2012062777A1/en

Synthesis of cyclic peptides

Cyclo[-Arg-Gly-Asp- 6 or 7 -Phe-Val-Ala-] (1 and 2). Resin loading. 2- chlorotrityl chloride-resin ( 1 50 m g , 1 .5m m ol/g ) was p laced i n a 20 m l polypropylene syringe fitted with a polyethylene filter disk. The resin was then washed with CH2CI2 (5 ^χ 0.5 min), and a solution of Fmoc-L-Gly-OH (334 mg, 1 .125 mmol, 5 equiv) and DIEA (239 μΙ_, 6.25 equiv) in CH₂CI₂ (2.5 ml_) was added. The mixture was then stirred for 15 min. Extra DIEA (239 μΙ_, total 12.5 mmol) was added, and the mixture was stirred for an additional 45 min. The reaction was stopped by adding 3 ^χ DCM/ MeOH/ DIEA (85: 10:5) and stirring for 1 0 m in. The Fmoc-L-Gly-O-resin product was subjected to the following washings/treatments with CH2CI2 (3 ^χ 0.5 min), DMF (3 ^χ 0.5 min), piperidine and DMF (5 ^χ 0.5 min). The loading was 0.50 mmol/g, as calculated by Fmoc determination.

Peptide coupling. Fmoc-L-Arg(Pbf)-OH (243 mg, 0.375 mmol, 5 equiv), Fmoc- L-Ala-OH (1 17 mg, 0.375 mmol, 5 equiv), Fmoc-L-Val-OH ( 127 mg, 0.375 mmol, 5 equiv) and Fmoc- L-Phe-OH ( 145 mg, 0.375 mmol, 5 equiv) were added sequentially to the above obtained H-L-Gly-O-resin using HCTU (155 mg, 0.375 mmol, 5 equiv), HOBt (50 mg, 0.375 mmol, 5 equiv) and DIEA (127 μΙ_, 0.75 mmol, 10 equiv) in DMF (2.5 ml_). In all cases, after 90 min of coupling, the ninhydrin test was negative. Removal of Fmoc group and washings were performed as described in general procedures. /V-Alloc-thiazole 6 or 7 (92 mg, 0.375 mmol, 5 equiv) was coupled with HATU (143 mg, 0.375 mmol, 5 equiv), HOAt (51 mg, 0.375 mmol, 5 equiv) and DIEA (127 μΙ_, 0.75 mmol, 10 equiv) for 90 min. This coupling was repeated twice in the same conditions. The Alloc group of the peptide resin was removed with Pd (PPh₃)₄ (9 mg, 0.0075 mmol, 0.1 equiv) in the presence of PhSiH₃ (92.5 μΙ_, 0.75 mmol, 10 equiv) in DCM for 20 min. This deprotection was repeated three times in the same conditions. After washing, the resin was treated with dry THF (2ml_) for 15 min. Meanwhile, Fmoc-L-Asp(tBu)-OH (154 mg, 0.375 mmol, 5 equiv) was added to a 68 mM solution of triphosgene in dry THF (1 .15 equiv). Sym-collidine (99.5 μΙ_, 0.75 mmol, 10 equiv) was added to the clear solution, upon which a precipitate of collidinium chloride was formed. DIEA (102 μΙ_, 0.6 mmol, 8 equiv) was added to the resin, immediately followed by addition of the suspension. This coupling was repeated four times in the same conditions. The reaction mixture was stirred at 50 °C during 48 h.

Peptide cleavage. Following Fmoc deprotection, the peptidyl-resin was treated with TFA-CH₂CI₂ (1 :99) (5 ^χ 30 s). The filtrate was collected on H₂0 (4 ml_) and the H₂0 was partially removed under reduced pressure. MeCN was then added to dissolve solid that formed during the removal of H₂0, and the solution was lyophilized to give 12 mg and 10 mg of the linear compounds 28 and 29 respectively with a purity of > 91 % as checked by HPLC (Column A, R_t 7.43 min and R_t 7.38 min respectively, linear gradient 35%-40% ACN in 15 min.)], which was used without further purification. MALDI-TOF-MS calculated for C50H71 N11 O13S2 1098.29; found mlz 1099.29 [M + H]⁺, 1 121 .28 [M + Na]⁺, 1 137.39 [M + K]⁺.

Synthesis in solution. Cyclization. The protected linear peptides 28 and 29 were dissolved in DMF (1 L, 10^“4 M), and HOAt (9.6 mg, 0.07 mmol, 5 equiv), DIPEA (24 μΙ_, 0.14 mmol, 10 equiv), and PyAOP (36.6 mg, 0.07 mmol, 5 equiv) were added. The mixture was stirred for 24 h at room temperature, and the course of the cyclization step was then checked by HPLC (Column A, R_t 1 1 -67 min and R_t 10.70 min respectively, linear gradient 45%-55% ACN in 15 min.). The solvent was removed by evaporation under reduced pressure and the protected cycle 30 and 31 were used in the next step without further purification. MALDI-TOF-MS calculated for C50H69N11 O12S2 1080.28; found mlz 1081 .28 [M + H]⁺, 1 103.27 [M + Na]⁺, 1 1 19.38 [M + K]⁺.

Side chain deprotection. The protected cyclopeptides 30 and 31 (14.7 mg, 19.04 pmol) were treated with TFA-H₂0 (95: 5) during 1 h. The solvent was removed by evaporation under reduced pressure.

Peptide purification. The crude product was purified by HPLC (Symmetry C₈ 5 μη-Ί, 30 mm x 100 mm), gradient of MeCN (30% to 75% in 15 min) MeCN (+0.05% TFA) in water (+0.05% TFA), 20 mL/min, detection at 220 nm, to give the cyclopeptides 1 and 2 (4.5 mg, 5.8 pmol and 6.5 mg, 8.37 pmol, 7.7% and 12% yield respectively). The products were characterized by HPLC (R_t 8.99 min, and R_t 8.02 min Column A, respectively, linear gradient 0%-100% ACN in 1 5 min. ) and by MALDI-TOF-MS: calculated for C33H45N11 O9S 771 .84; found mlz 772.84 [M + H]⁺, 794.83 [M + Na]⁺, 810.94 [M + K]⁺.

Cyc/o-[Arg-Gly-Asp-Thz1X-] (3). General procedure for cyclopeptide synthesis. Solid phase synthesis: The synthesis of the linear peptide H- Asp(tBu)-XX-Arg(Pbf)-Gly-OH was performed using Fmoc-based solid phase peptide synthesis with 2-chlorotrityl chloride resin (2.0 g, 3.2 mmol).

Resin loading: Fmoc-Gly-OH (594 mg, 2.0 mmol) was attached to the resin with DIPEA in DCM at room temperature for 1 .5 h. The remaining trityl groups were capped adding 0.5 mL of MeOH for 30 min. After that, the resin was filtered and washed with DCM (2x), DMF (2x). The loading of the resin was determined by titration of the Fmoc group (Chan WC and White PD. Fmoc Solid Phase Peptide Synthesis. Oxford University Press: New York, 2000). The final loading was 2.0 mmol/g. The Fmoc group was eliminated by treatment with 20% piperidine in DMF (2X10 min). The resin was washed with DMF (3x), DCM (3x). Peptide coupling: Fmoc-Arg(Pbf)-OH (5.19 g, 8.0 mmol), DIPCDI (1.23 mL, 8.0 mmol) and HOBt (1.08 g, 8.0 mmol) were dissolved in DMF and added to the resin for 1 .5 h. The end of the coupling was monitored by ninhydrin test (free amine group) (Kaiser E et al. Anal Biochem 1970, 34:595-598). The resin was filtered and washed with DMF (3X) and DCM (3X). The Fmoc group was eliminated with 20 % piperidine in DMF (2X10 min).

The coupling of the thiazole module was carried out with 8 (1 .14 g, 3.0 mmol), PyAOP (1 .56 g, 3.0 mmol) and DIPEA (1 .02 mL, 6.0 mmol) in DMF for 1 .5 h. The completion of the reaction was checked with the ninhydrin test. Finally the deprotection of the amine and coupling of the Fmoc-Asp(‘Bu)-OH were carried out under the same conditions of the second amino acid.

Peptide cleavage: The resin bound peptide was treated with 2% TFA in DCM (6 x 30 sec.) The resin was washed with DCM and the combined solution was evaporated under vacuum with Et₂0 several times, furnishing the linear peptide 32 as a white solid. The peptide was used for the next step without purification.

H PLC (gradient 20 to 80% of CH₃CN in 1 5 m in): t_R= 8.33 min. HPLC-MS (ES(+)): m/z 795.3.

Synthesis in solution. Cyclization: The product 32 (200 mg, 0.251 mmol) was dissolved in anhydrous DMF (50 mL, 5 mM), PyAOP (262 mg, 0.503 mmol) and DIPEA (213 μί, 1 .255 mmol) were added. The reaction was monitored by HPLC. Once the reaction was finished, the DMF was evaporated under vacuum. The crude was dissolved in AcOEt and the solution was washed with NH₄CI_Sat and Na₂CO3 _sat. The organic layer was collected, dried over Na₂SO₄, filtered and concentrated under vacuum. The peptide was purified by flash chromatography (CHCIs/MeOH 8:2) furnishing the protected cyclic peptide 33 as a white solid (1 56 mg, XX%). HPLC (gradient 40 to 90% of CH₃CN in 1 5 min): t_R= 8.86 min. HPLC-MS (ES(+)): m/z 778.2

Side chain deprotection: The protected peptide 33 (125 mg, XX mmol), was treated with 25 mL of a solution of TFA H₂O (95:5). After 3 h, the solvent was evaporated under vacuum and the residue was precipitated with Et₂O (4X). The Et₂O solution was discarded and the white solid was lyophilized to afford 3 55 mg (XX%).

Peptide purification. The end product 3 was dissolved in 5 ml MilliQ water and it was filtered through a 0.2 pm filter. The cyclic peptide was purified by semipreparative RP-HPLC using acetronitrile (0.05% TFA)/water (0.1 % TFA). The HPLC sample was vacuum concentred and transformed into the hydrochloride salt lyophilized with water with 0.05% HCI.¹H-NMR (500 MHz, H₂0:D₂0-d² 9: 1 , 278 K): δ = 9.29 (t, NH Gly), 9.20 (d, J = 7.24 Hz, NH Asp), 8.90 (t, J = 5.89/5.89 Hz, NH Thz), 8.46 (d, J = 8.93 Hz, NH Arg), 7.79 (s, CH Thz), 7.22 (t, J = 5.39/5.39 Hz, ΝΗ_ε Arg), 4.75 (m, CH_a Arg), 4.63 (m, CH_a Asp), 4.04 (dd, J = 3.35/14.90 Hz, CH_a Gly), 3.82 (dd, J = 6.69/14.96 Hz, CH_a Gly), 3.17 (m, CH₂₅ Arg), 2.89 (m, CH_2p Asp), 1 .92 (m, CH _p Arg), 1 .82 (m, CH_P Arg), 1 .63 (m, CH₂ Arg). HPLC (gradient 0 to 20% of CH₃CN in 15 min): t_R= 10.52 m in. HRMS (E IS) m/z calculated 468.1540

found 469.16099 (M+H)⁺.

Cyc/o-[Arg-Gly-Asp-Thz2X-] (4). The cyclopeptide 4 was prepared according to the process followed for 3 and using bithiazole 9 (XX mg, YY mmol) instead of 8. The linear peptide 34: HPLC (gradient 0 to 100% CH₃CN in 15 min.): t_R = 10.34 min, HPLC-MS (ES(+)): m/z 877.81 . The protected peptide 35: HPLC (gradient 0 to 100% CH₃CN in 15 min.): t_R = 13.91 min, HPLC-MS (ES(+)): m/z 860.54. The final peptide 4: ¹H-NMR (500 MHz, H₂0:D₂0-d² 9: 1 , 298 K): δ = 8.93 (s_broad, NH Gly), 8.82 (d, J = 7.62 Hz, NH Asp), 8.75 (t, J = 5.69/5.69 Hz, NH Thz), 8.51 (d, J = 7.62 Hz, NH Arg), 8.05 (s, CH Thz¹), 7.50 (s, CH Thz²), 7.19 (t, J = 5.38/5.38 Hz, ΝΗ_ε Arg), 4.13 (dd, J = 5.82/14.24 Hz, CH Gly), 3.87 (dd, J = 5.96/15.69 Hz, CH Gly), 3.21 (m , CH₂₅ Arg), 2.94 (m, CH_2p Asp), 1 .95 (m , CH_P Arg), 1 .87 (m , CH_P Arg), 1 .68 (m , CH_2y Arg). HPLC (gradient 1 0 to 25% of CH₃CN in 1 5 m in): t_R = 8.73 min. HRMS (EIS) m/z calculated 551 .1369 (C₂oH₂₅N₉0₆S₂) found 552.14392 (2M+2H)⁺.

Cyc/o-[Arg-Gly-Asp-Thz3X-] (5). The cyclopeptide 5 was prepared according to the process for 3 and using trithiazole 10 (XX mg, YY mmol) instead of 8. The linear peptide 36: HPLC (gradient 20 to 80% of CH₃CN in 15 min.): t_R = 7.60 min, HPLC-MS (ES(+)): m/z 961 .23. The protected peptide 37: HPLC (gradient 20 to 80% of CH₃CN in 15 m in. ): t_R = 1 3.13 min, HPLC-MS (ES(+)): m/z 944.3. The final peptide 5: HPLC (gradient 10 to 30% CH₃CN in 15 m in): t_R = 8.26 m in. HRMS (E IS) m/z calculated 634.1 1 99 (C₂₃H₂₆N₁₀O₆S₃) found 635.12683 (2M+2H)⁺. ¹H-NMR (500 MHz, DMSO-d⁶ 298 K): δ = 9.21 (t, J = 5.4, NH Gly), 8.72 (m, NH Asp + NH Thz), 8.37 (s, CH Thz¹), 7.96 (d, J = 9.2, NH_a Arg), 7.77 (s, CH Thz²), 7.68 (t, J = 6.0, ΝΗ_ε Arg), 7.23 (s, CH Thz³), 4.83 (dd, J = 14.3, 8.5, CH_a Arg), 4.72 (dd, J = 16.3, 6.6, CH Thz), 4.59 (m, CH Thz + CH_a Asp), 3.89 (d, J = 1 1 .5, CH Gly), 3.59 (d, J = 9.7, CH Gly), 3.13 (dd, J = 12.6, 6.3, CH₂₅ Arg), 2.81 (dd, J = 16.3, 4.3, CH_P Asp), 2.58 (dd, J = 16.5, 8.7, CH_P Asp), 1 .82 (m, CH_P Arg), 1 .71 (m, CH_P Arg), 1 .49 (m, CH_2y Arg).

Cilengitide. The cilengitide was prepared according to the method described in Dechantsreiter MA et al. (J Med Chem 1999, 42:3033-3040). ¹H- NMR (500 MHz, H₂0:D₂0-d² 9: 1 , 298 K): δ = 8.55 (d, J = 8.06 Hz, NH Asp), 8.37 (d, J = 7.28 Hz, NH Arg), 8.13 ( d, J = 9.19 Hz, NH Phe), 7.97 (m, NH Gly), 7.34 (m, 2H, C₆H₅ Phe), 7.26 (m, 3H, C₆H₅ Phe), 7.22 (t, J = 5.53/5.53 Hz, ΝΗ_ε Arg), 5.19 (dd, J = 8.58/16.02 Hz, CH_a Phe), 4.56 (dd, J = 7.45/- Hz, CH_a Asp), 4.34 (d, J = 10.89 Hz, CH_a MeVal), 4.12 (dd, J = 7.80/14.63 Hz, CH Gly), 3.95 (dd, J = 6.84/15.33 Hz, CH_a Arg), 3.54 (dd, J = 3.37/14.60 Hz, CH Gly), 3.20 (m , CH₂₅ Arg), 3.02 (m, CH_2p Phe), 2.88 (s, CH₃ MeVal), 2.84 (dd, J = 7.26/16.68 Hz, CH_P Asp), 2.63 (dd, J = 7.60/16.54 Hz, CH_P Asp), 2.06 (m, CH_P Val), 1 .91 (m, CH_2p Arg), 1 .57 (m, CH₂ Asp), 0.88 (d, J = 6.55 Hz, CH₃ Val¹), 0.56 (d, J = 6.49 Hz, CH₃ Val²).

PAPER

Journal of medicinal chemistry (1999), 42(16), 3033-40.

Peptide Science (2001),  Volume Date2000, 37th, 249-250.

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References

Cilengitide

Names
IUPAC name 2-[(2S,5R,8S,11S)-5-benzyl-11-{3-[(diaminomethylidene)amino]propyl}-7-methyl-3,6,9,12,15-pentaoxo-8-(propan-2-yl)-1,4,7,10,13-pentaazacyclopentadecan-2-yl]acetic acid
Identifiers
CAS Number	188968-51-6
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL429876
ChemSpider	154046
IUPHAR/BPS	6597
KEGG	D03497
MeSH	Cilengitide
PubChem CID	176873
UNII	4EDF46E4GI
CompTox Dashboard (EPA)	DTXSID9044035
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show SMILES
Properties
Chemical formula	C27H40N8O7
Molar mass	588.656 g/mol
Density	1.417 g/mL
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

/////////CILENGITIDE, циленгитид , سيلانجيتيد ,西仑吉肽 , PHASE 3, EMD 121974, EMD-121974, UNII-4EDF46E4GI, orphan drug , MERCK, glioblastoma, 

CC(C)C1C(=O)NC(C(=O)NCC(=O)NC(C(=O)NC(C(=O)N1C)CC2=CC=CC=C2)CC(=O)O)CCCN=C(N)N