The application of vinylogous iminium salts and related synthons to the regiocontrolled preparation of 2,3- and 2,5-disubstituted pyrroles
作者:John T Gupton、Scott A Petrich、Lana L Smith、Marc A Bruce、Phong Vu、Karen X Du、Eric E Dueno、Claude R Jones、James A Sikorski
DOI:10.1016/0040-4020(96)00338-9
日期:1996.5
1-substituted vinamidinium salts with sarcosine ethyl ester produced 2,3-disubstituted pyrroles; a similar reaction with glycine ethyl ester gave 2,5-disubstituted pyrroles. Reactions of related three-carbon synthons with sarcosine and glycine were studied under basic, neutral and acidic conditions which demonstrated the utility of these derivatives for the regiocontrolled preparation of disubstituted pyrroles
An efficient, regiocontrolled synthesis of 5-aryl-2-carbethoxypyrroles from 3-aryl-3-chloropropeniminium salts
作者:John T. Gupton、Dale A. Krolikowski、Richard H. Yu、Vu Phong、James A. Sikorski、Maria L. Dahl、Claude R. Jones
DOI:10.1021/jo00046a033
日期:1992.9
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.