s toward the synthesis of two new classes of spirooxindole-based polycyclic systems. Mechanistically, this conceptually simple and high atom-economical reaction proceeds via an SN2-like intermolecular epoxide ring-opening, accompanied by a concomitant intramolecular SNAr reaction. From a synthetic aspect, the notable features of the process are its full regioselectivity, operational simplicity using
虽然数百篇文献报道描述了基于螺
吲哚的五元和六元杂环的制备,但螺连接至2-羟
吲哚核心的七元杂环的构建迄今为止开发较少。在此,我们公开了螺环环氧
吲哚和2-(2-
氟芳基) -1H-
苯并咪唑或2-
氟-N-芳基苯磺酰胺的碱介导的(4+3)环化,以合成两类新的基于螺环
吲哚的化合物多环系统。从机理上讲,这种概念上简单且高原子经济性的反应通过类似 S N 2 的分子间
环氧化物开环进行,并伴有伴随的分子内 S N Ar 反应。从合成方面来看,该工艺的显着特点是其完全的区域选择性、在无过渡
金属条件下使用现成底物的操作简单性、高产率和广泛的底物范围。