Tag «1228342-28-6»

Process Development and Good Manufacturing Practice Production of a Tyrosinase Inhibitor via Titanium-Mediated Coupling between Unprotected Resorcinols and Ketones

It’s only fair to share…   (S)-4-(2,4-Dihydroxyphenyl)-N-(1-phenylethyl)piperidine-1-carboxamide (1) In a………………….. to yield crude 1 (3.51 kg, 77%, 97.7 A% purity). Recrystallization: In a 100 L double jacketed reactor were charged crude 1 (3.51 kg, 10.31 mol, 1.0 equiv), iPrOH (27.0 L, 7.5 vol), AcOH (74.1 g), and water (27.0 L, 7.5 vol). The suspension was warmed …