phosphoric acid dibenzyl ester (3S,4S)-4-[2-(4-benzyl-3-hydroxy-piperidin-1-yl)-ethanesulfonyl]-phenyl ester → phosphoric acid mono-{(3S,4 S)-4-[2-(4-benzyl-3-hydroxy-piperidin-1-yl)-ethanesulfonyl]-phenyl} ester

Participants

Reaction Conditions

Reaction Steps

A solution of 1.20 g, (1.73 mmol) phosphoric acid dibenzyl ester (3S,4S)-4-[2-(4-benzyl-3-hydroxy-piperidin-1-yl)-ethanesulfonyl]-phenyl ester in 40 ml MeOH and 6 ml water was hydrogenated at room temperature (20 bar, 5 h). The reaction mixture was concentrated to 20 ml and 500 ml water were added. The reaction mixture was filtered and the catalyst was washed with water. The filtrate was concentrated under reduced pressure until the product precipitates. The mixture was then cooled to 0° C. and 200 ml MeOH were added dropwise. After two hours the solid was filtered, washed with cold MeOH and dried at 60° C. under high vacuum to give 380 mg (0.83 mmol, 48%) of phosphoric acid mono-{(3S,4S)-4-[2-(4-benzyl-3-hydroxy-piperidin-1-yl)-ethanesulfonyl]-phenyl} ester as colorless crystalls.

Provenance & Evidence