Cyclisation of arylnitrenium ions to the aporphine ring system: remarkable formation of a sixteen-membered ring by an intramolecular electrophilic aromatic substitution
作者:Rudolph A. Abramovitch、Pennamuthiriar Chinnasamy、Kaspar Evertz、Gottfried Huttner
DOI:10.1039/c39890000003
日期:——
but the p-nitrenium isomers do not form a 5-membered ring unless the ring undergoing attack is strongly activated; on the other hand, 1-(p-nitreniobenzyl)-7-benzyloxy-6-methoxy-2-methyl- 1,2,3,4-tetrahydroisoquinoline undergoes a remarkable intramolecular electrophilic substitution to give (8)(confirmed by an X-ray study) containing a 16-membered ring.
从1-(m -nitrenio苄基)-1,2,3,4-四氢异喹啉环化的π-阳离子离环成9-和11-氨基紫杉烷,但是p- nitrenium异构体除非形成环,否则不会形成5元环攻击被强烈激活;另一方面,1-(对-硝基苯甲基)-7-苄氧基-6-甲氧基-2-甲基-1,2,3,4-四氢异喹啉经历了显着的分子内亲电取代反应,得到(8)(由X确认射线研究)包含一个16元环。