N-Substituted cyanacetohydrazides in the synthesis of 3,3-dialkyl-1,2,3,4-tetrahydroisoquinolines by Ritter reaction
作者:Alexander G. Mikhailovskii、Denis V. Korchagin、Aleksey S. Yusov、Oksana V. Gashkova
DOI:10.1007/s10593-017-2180-z
日期:2017.10
Cyanacetohydrazide, protected at the nitrogen atom of hydrazide group, underwent cyclocondensation by Ritter reaction with 3,3-dialkylbenzylcarbinols, forming 3,3-dialkyl-1,2,3,4-tetrahydroisoquinolines. The reagents used for the protection of hydrazide group were benzaldehyde, benzoyl chloride, phenyl isocyanate, and phenyl isothiocyanate. As a result, N-substituted derivatives of 2-(3,3-dialkyl-3
在酰肼基团的氮原子处被保护的氰基酰肼通过与3,3-二烷基苄基甲醇的里特反应进行环缩合,形成3,3-二烷基-1,2,3,4-四氢异喹啉。用于保护酰肼基的试剂是苯甲醛,苯甲酰氯,异氰酸苯酯和异硫氰酸苯酯。其结果是,Ñ取代2-(3,3-二烷基-3,4-二氢异喹啉-1(2的衍生物Н) -亚基)乙酰肼,得到- Ñ -phenylmethylidene ethanehydrazide,acetylbenzohydrazide,和Ñ -phenylhydrazinecarboxamide。在这些条件下,用异硫氰酸苯酯酰化的氰尿酰肼得到杂环化产物– 1,3,4-噻二唑。