A process for preparing cotarnine is provided which comprises oxidizing the amino group of a tetrahydroisoquinoline compound represented by the following formula (I): ##STR1## to convert said compound into a dihydroisoquinolinium salt represented by the following formula (II): ##STR2## wherein A.sup.- represents an anion, and then hydrolyzing said dihydroisoquinolinium salt.
There is provided a novel benzylamine derivative of the formula I:
wherein R' represents a hydrogen atom or a methyl group, X represents a hydrogen atom, a methyl group or a tosyl group. and Y represents a hydrogen atom, a methyl group of
in which R2 and R3 being identical or different from each other represent independently a lower alkyl group.
Process for preparing cotarnine of formula :
which comprises hydrolyzing a dihydroisoquinolonium salt having the following formula (D)
wherein A represents an anion
制备式 :
其中包括水解具有下式(D)的二氢异喹啉鎓盐
其中 A 代表阴离子
4-hydroxy-8-methoxy-2-methyl-6, 7-methylenedioxy-1,2,3,4-tetrahydroisoquinoline, and process for preparing the same
申请人:MITSUBISHI KASEI CORPORATION
公开号:EP0404694A2
公开(公告)日:1990-12-27
The present invention provides a new benzylamine derivative of formula :
and a process for preparing the same.