反应详情

A solution of 3-(4-hydroxy-2-methyl-phenyl)-propionic acid methyl ester (6.30 g, 32.1 mmol) and 1-[2-(4-bromo-phenyl)-4-isopropyl-oxazol-5-yl]-ethanol (9.05 g, 29.2 mmol) in toluene (300 mL) is degassed and filled with nitrogen for 3 times. Tributylphosphine (7.70 g, 38.1 mmol) is added to the reaction mixture under nitrogen at 0° C., followed by addition of of 1,1′-(azodicarbonyl)-dipiperidine (8.84 g, 35.0 mmol). The reaction mixture is allowed to warm to room temperature and stirred overnight, the mixture is loaded directly on silica gel column chromatography with 10–15% EtOAc/Hexanes to afford the title compound (11.8 g, 79%).

1. additionfilled with nitrogen for 3 times