A process for the preparation of hexahydroisoquinolines from...

Details A process for the preparation of hexahydroisoquinolines from... A process for the preparation of hexahydroisoquinolines from...

C - Chemistry, Metallurgy

07

D

C07D 217/20 (2006.01)

Patent

CA 2672745

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.

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