Ethyl Acetate → (3R,4S)-4-{4-[2-(2,6-Dichloro-4-methyl-phenoxy)-ethoxy]-phenyl}-piperidine-1,3-dicarboxylic Acid 1-tert-butyl Ester 3-methyl Ester

Participants

Reaction Conditions

Reaction Steps

MeONa (2.27 g, 42 mmol) was added to a sol. of compounds D5 (22.6 g, 42 mmol) in MeOH (200 mL). The mixture was stirred at 70° C. for 6 h, and MeONa (2.27 g, 42 mmol) was added again. The mixture was stirred at 70° C. for 2 days, and was allowed to cool to rt. EtOAc was added, and the resulting mixture was washed with aq. 1M HCl and brine. The org. layer was dried over MgSO4, filtered, and the solvents were removed under reduced pressure. Purification of the crude by FC (MeOH/CH2Cl2 5:95→10:90) yielded the title compound (10.7 g, 47%). LC-MS: tR=1.19 min, ES+=538.39.

Provenance & Evidence