It’s only fair to share… Ethyl 2-[(6,7-dimethoxyquinazolin-4-yl)amino]-5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophene-3-carboxylate (15b) Yield: 76%; mp: 254–256°C; IR (cm−1): 3200 (NH), 2974, 2854 (CH-aliphatic), 1656 (C=O); 1H NMR (DMSO-d6) δ ppm 1.03 (t, 3H, CH3CH2, J = 7.2 Hz), 1.21 (t, 2H, CH2, J = 6.9 Hz), 2.88 (t, 2H, CH2, J = 6.9 Hz), 3.40 (q, 2H, CH2, J = 6.9 Hz), 3.88 (s, 3H, OCH3), 3.91 (s, 3H, OCH3), 3.96 …