Method for preparing 4-methylamino-4-phenylpiperidine
申请人:——
公开号:US20040181071A1
公开(公告)日:2004-09-16
The invention relates to a process for preparing a 4-alkoxycarbonylamino-1-benzyl-4-phenylpiperidine of formula (I)
1
via hydrolysis of 1-benzyl-4-cyano-4-phenylpiperidine (II) in acidic medium and treatment of the 1-benzyl-4-phenyl-4-piperidinecarboxamide (III) thus obtained with bromine in the presence of an alkali metal alkoxide.
The invention also relates to a process for preparing 4-methylamino-4-phenylpiperidine from compound (II).