反应详情

The compound of Formula (IX) was reacted with sulphuric acid and sodium triacetoxy borohydride, in presence of suitable solvent such as ethyl acetate and at temperature below −5° C., to provide (2S)-5-[(benzyloxy)amino]-2-cyanopiperidine (X). The compound of Formula (X) was purified by forming oxalate salt. The compound of Formula (X) was reacted with oxalic acid in a mixture of ethylacetate and acetone to provide (2S)-5-[(benzyloxy)amino]-2-cyanopiperidine ethanedioate (1:1) (XI), which was further treated with sodium hydrogen carbonate to obtain purified (2S)-5-[(benzyloxy)amino]-2-cyanopiperidine (XII). The racemic compound (XI) was treated with methanol to obtain pure (2S,5R)-5-[(benzyloxy)amino]-2-cyanopiperidine ethanedioate.