Halo Substituent Effects on Intramolecular Cycloadditions Involving Furanyl Amides
作者:Albert Padwa、Kenneth R. Crawford、Christopher S. Straub、Susan N. Pieniazek、K. N. Houk
DOI:10.1021/jo0602322
日期:2006.7.1
Intramolecular Diels−Alder reactions involving a series of N-alkenyl-substituted furanyl amides were investigated. Stable functionalized oxanorbornenes were formed in high yield upon heating at 80−110 °C. The cycloaddition reactions include several bromo-substituted furanyl amides, and these systems were found to proceed at a much faster rate and in higher yield than without substitution. This effect