Lithium Hydroxide → 2-((3R,5R,6S)-5-(3-Chlorophenyl)-6-(4-chlorophenyl)-3-methyl-2-oxo-1-((S)-1-(trifluoromethylsulfonamido)butan-2-yl)piperidin-3-yl)acetic acid

Participants

Reaction Conditions

Reaction Steps

A reaction vial under argon was charged with methyl 2-((3R,5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-1-((S)-1-hydroxybutan-2-yl)-3-methyl-2-oxopiperidin-3-yl)acetate (0.048 g, 0.1 mmol; Example 186, Step A), 2-(tributylphosphoranylidene) acetonitrile (0.036 g, 0.15 mmol) and trifluoromethanesulfonamide (0.022 g, 0.15 mmol) in toluene (0.5 mL). The reaction mixture in the reaction vial was sealed and stirred at 110° C. for 1 h. Column chromatography on silica gel gave a mixture of methyl 2-((3R,5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-methyl-2-oxo-1-((S)-1-(trifluoromethylsulfonamido)butan-2-yl)piperidin-3-yl)acetate with an unknown impurity. This mixture was hydrolyzed with LiOH (1N solution in water, 0.3 mL) in ethanol (0.5 mL) for 3 h at rt. HPLC purification (C18 column, eluted with 10 to 95% CH3CN in water, with 0.1% TFA) gave the title compound.

Provenance & Evidence