An efficient, regiocontrolled synthesis of 5-aryl-2-carbethoxypyrroles from 3-aryl-3-chloropropeniminium salts
摘要:
A variety of 3-aryl-3-chloropropeniminium salts react with alpha-amino acid esters under basic conditions to produce 2-carbethoxy-5-arylpyrroles in a regioselective manner. The overall process represents a short, efficient, and convergent synthesis of 2,5-disubstituted pyrroles, and azomethine ylides or azapentadienyl anions may be involved as intermediates.
The application of unsymmetrical vinylogous iminium salts and related synthons to the preparation of monosubstituted triazolo [1, 5-a]pyrimidines
作者:Scott A. Petrich、Zhenrong Qian、Lisa M. Santiago、John T. Gupton、James A. Sikorski
DOI:10.1016/s0040-4020(01)89564-8
日期:1994.1
The reaction of vinylogous iminiumsalts and related analogs with 3-amino-1,2,4-triazole to yield 7-substituted and 5-substituted triazolo [1,5-a]pyrimidines is described.