2-[2-Chloro-5-((R)-3-ethoxycarbonyl-piperidin-1-yl)-phenyl]-benzoimidazole-1-carboxylic acid tert-butyl ester → (R)-1-[3-(1H-Benzoimidazol-2-yl)-4-chloro-phenyl]-piperidine-3-carboxylic acid ethyl ester

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Reaction Steps

Method 2—Step d To a mixture of 2-[2-Chloro-5-((R)-3-ethoxycarbonyl-piperidin-1-yl)-phenyl]-benzoimidazole-1-carboxylic acid tert-butyl ester (1.30 g, 2.68 mmol) in dichloromethane (2 mL), 2M HCl in Et2O (10 mL) was added and the resulting mixture was stirred overnight at room temperature. The solid was filtered off, then recovered with 10% NaOH (10 mL) and extracted with dichloromethane (3×10 mL). The organic layer was dried over Na2SO4, filtered and concentrated under reduced pressure, to get 0.81 g of the title compound without further purifications (85%).

Provenance & Evidence