Process for the Preparation of Hexahydroisoquinolines from 1,2,3,4-Tetrahydroisoquinolines
申请人:Cantrell Gary L.
公开号:US20090247756A1
公开(公告)日:2009-10-01
The present invention is directed to processes for the synthesis of morphinans. In particular, a process for the asymmetric reduction of an imine moiety in a 3,4-dihydroisoquinoline to produce a tetrahydroisoquinoline, followed by a Birch reduction to produce a hexahydroisoquinoline. In various embodiments, the 3,4-dihydroisoquinoline contains a phenol moiety protected with a labile protecting group. In other embodiments, the imine reduction reaction mixture contains silver tetrafluoroborate.
本发明涉及吗啡内酯的合成过程。特别是一种过程,用于不对称还原3,4-二氢异喹啉中的亚胺官能团,以产生四氢异喹啉,然后进行Birch还原以产生六氢异喹啉。在各种实施例中,3,4-二氢异喹啉含有一个带有不稳定保护基的酚官能团。在其他实施例中,亚胺还原反应混合物含有四氟硼酸银。