A One-Pot Stereoselective Synthesis of Electron-Deficient 4-Substituted (E,E)-1-Arylsulfonylbuta-1,3-dienes and Their Chemoselective [3+2] Cycloaddition with Azomethine Ylides - A Simple Synthesis of 1,3,4-Trisubstituted Pyrrolidines and Pyrroles
作者:Kalapattu Balasubramanian、Ulaganathan Sankar、Susarla Mahalakshmi
DOI:10.1055/s-0033-1339181
日期:——
A simple and efficient method for the synthesis of ( E , E )-1-(arylsulfonyl)buta-1,3-dienes bearing electron-withdrawing substituents like cyano and ethoxycarbonyl at position 4, involving a one-pot alkylation of bis(phenylsulfonyl)methane with trans -ethyl 4-bromocrotonate/ trans -4-bromocrotononitrile, and elimination of arylsulfinic acid, is described. These dienes undergo facile mono [3+2] cycloaddition
一种简单有效的合成 ( E , E )-1-(芳基磺酰基)buta-1,3-二烯的方法,该方法在 4 位带有吸电子取代基,如氰基和乙氧基羰基,包括双(苯磺酰基)的一锅烷基化) 甲烷与反式-4-溴巴豆酸乙酯/反式-4-溴巴豆腈,以及芳基亚磺酸的消除。这些二烯通过偶氮甲碱叶立德化学选择性进行简单的单 [3+2] 环加成,以提供功能化的 1,3,4-三取代吡咯烷。在温和条件下用MnO 2 ·SiO 2 氧化这些环加合物提供1,3,4-三取代的吡咯。