报道了一种前所未有的银促进的区域选择性 (4 + 1) 异氰乙酸酯与吡啶盐的环化。已建立的协议提供对一系列合成有用的 N-稠合杂环支架的受控、简便和模块化访问,这些支架包含吲哚嗪、吡咯并 [1,2- a ] 喹啉、吡咯并 [2,1- a ] 异喹啉和 1 H -咪唑[4,5 - a ]indolizin-2(3 H )-ones。提出了涉及亲核加成/质子化/消除/环异构化的机制途径。
A formal [3 + 2] annulation reaction of propargyl sulfonium compounds and <i>N</i>-ylides: access to pyrrolo[2,1-<i>a</i>]quinolines, pyrrolo[2,1-<i>a</i>]phthalazines and indolizines
作者:Jing Zheng、Xiaojie He、Hong Xu、Hua Liu、Weiran Yang
DOI:10.1039/d0ob01739f
日期:——
A sequential [3 + 2] annulation of prop-2-ynylsulfonium salt and N-ylides was developed, leading to the formation of a series of pyrrolo[2,1-a]quinolines, pyrrolo[2,1-a]phthalazines and indolizines. The protocol featured the simultaneous one-pot formation of three new C–C bonds in moderate yields under mild conditions. In this reaction, the prop-2-ynylsulfonium salts acted as the C2 synthons and sulfide
开发了丙-2-炔基锍盐和N-叶立德的顺序[3 + 2]环化,导致形成一系列吡咯并[2,1 - a ]喹啉、吡咯并[2,1 - a ]酞嗪和中氮茚。该协议的特点是在温和条件下以中等收益率同时一锅形成三个新的 C-C 键。在该反应中,prop-2-ynyl 锍盐充当 C2 合成子,硫化物充当离去基团。所得产物可作为合成多种化合物的有用前体。