1,2,3,4-Tetrahydro-2-isoquinoline-derivatives of the formula ##STR1## wherein R signifies hydroxy, lower alkylamino, lower alkoxy or phenyl-C.sub.2-6 -alkoxy which can carry one or more lower alkyl or lower alkoxy substituents on the phenyl ring, can be manufactured by cyclizing a phenethylamine derivative of the formula ##STR2## wherein Z signifies benzyloxycarbonyl and R" signifies hydroxy, lower alkylamino, lower alkoxy or phenyl-lower-alkoxy which can carry one or more lower alkyl or lower alkoxy substituents on the phenyl ring, with formaldehyde in the presence of sulphuric acid in acetic acid to a corresponding tetrahydroisoquinoline derivative of the formula ##STR3## and cleaving off the group Z in the compound obtained.
1,2,3,4-四氢-2-
异喹啉衍
生物的
化学式为##STR1##其中R代表羟基、较低的烷基
氨基、较低的烷氧基或苯基-C.sub.2-6-烷氧基,苯环上可以带有一个或多个较低的烷基或较低的烷氧基取代基,可以通过在
乙酸中存在
硫酸的情况下,将具有以下
化学式的苯
乙胺衍
生物环化制备:##STR2##其中Z代表苄氧羰基,R"代表羟基、较低的烷基
氨基、较低的烷氧基或苯基-较低烷氧基,苯环上可以带有一个或多个较低的烷基或较低的烷氧基取代基,然后裂解得到化合物中的Z基。