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.
作者:Béatrice Quiclet-Sire、Frédérique Wendeborn (née Bertrand)、Samir Z. Zard
DOI:10.1039/b207061h
日期:——
The radical reaction between an N-ethylsulfonylenamide and an α-xanthyl ketone gives an intermediate γ-keto imine which spontaneously ring-closes to the pyrrole.
General method for the synthesis of 5-arylpyrrole-2-carboxylic acids
作者:Jesús Ezquerra、Concepción Pedregal、Almudena Rubio、Jesús Valenciano、José Luis García Navio、Julio Alvarez-Builla、Juan José Vaquero
DOI:10.1016/s0040-4039(00)73741-5
日期:1993.9
5-Arylpyrrole-2-carboxylic acids are prepared by DDQ oxidative aromatization of the corresponding ethyl 2-aryl-Δ1-pyrroline-5-carboxylate followed by basic hydrolysis.
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.