Extending the Scope of a Known Furan Synthesis - A Novel Route to 1,2,4-Trisubstituted Pyrroles
作者:Marko Friedrich、Andreas Wächtler、Armin de Meijere
DOI:10.1055/s-2002-22707
日期:——
2-(Acylmethylene)propanediol diacetates, which cyclize readily under acidic conditions to give furans (76-84%) react with primary amines under palladium catalysis to give 1,2,4-trisubstituted pyrroles in moderate to good yields (39-53%). When glycine methyl ester is used as the amine, substituted methyl pyrrol-1-ylacetates (31-82%) are obtained.
2-(酸酰亚甲基)丙二醇二乙酸酯在酸性条件下容易环化,生成呋喃(76-84%),并在钯催化下与一级胺反应,生成1,2,4-三取代吡咯,产率适中至良好(39-53%)。当使用甘氨酸甲基酯作为胺时,可得到取代的甲基吡咯-1-乙酸酯(31-82%)。