Highly Regioselective Friedländer Annulations with Unmodified Ketones Employing Novel Amine Catalysts: Syntheses of 2-Substituted Quinolines, 1,8-Naphthyridines, and Related Heterocycles
作者:Peter G. Dormer、Kan K. Eng、Roger N. Farr、Guy R. Humphrey、J. Christopher McWilliams、P. J. Reider、Jess W. Sager、R. P. Volante
DOI:10.1021/jo026203i
日期:2003.1.1
Catalysts were evaluated on the preparation of 2-substituted quinolines, 1,8-naphthyridines, and chromone derivatives from unmodified methyl ketones and o-aminoaromatic aldehydes. While oxide catalysts yielded the 2,3-dialkyl substituted products, cyclic secondary amines provided the 2-alkylsubstutited products regioselectively. In particular, pyrrolidine derivatives provided the highest regioselectivity