METHOD FOR PREPARING DISUBSTITUTED PIPERIDINE AND INTERMEDIATES

Process for preparing piperidin-3-ylamine derivative (I), comprises: treating betaketosulfoxonium compound (b) with hydrochloric acid to obtain a hexanoic acid derivative (II), which is treated without isolating a derivative of hydroxylamine to obtain hydroxyimino-hexanoic acid derivative (III); deprotecting amine by action of acid to obtain hydroxyimino-hexanoic acid derivative (IV); and cyclization by action of base to obtain piperidin carboxylic acid derivative (V), which reduces the oxime by the action of a reducing agent to obtain (I), and salifying by the action of an acid. Process for preparing piperidin-3-ylamine derivative of formula (I), comprises: treating betaketosulfoxonium compound of formula (b) with hydrochloric acid to obtain a hexanoic acid derivative of formula (II), which is treated without isolating a derivative of hydroxylamine to obtain hydroxyimino-hexanoic acid derivative of formula (III); deprotecting amine by action of acid to obtain hydroxyimino-hexanoic acid derivative of formula (IV); and cyclization by action of base to obtain piperidin carboxylic acid derivative of formula (V), which reduces the oxime by the action of a reducing agent to obtain (I), and salifying by the action of an acid. P 1, P 2 : carboxylic and oxyamine acid function protecting group; and P3 : amine protecting group. Independent claims are included for: (1) hydroxyimino-hexanoic acid derivative (III); (2) hydroxyimino-hexanoic acid derivative (IV); and (3) piperidin carboxylic acid derivative (V). [Image] [Image].