Synthesis of Acridines and Persubstituted Phenols from Cyclobutenones and Active Methylene Ketones
作者:Xiao-Dan Han、Yu-Long Zhao、Jia Meng、Chuan-Qing Ren、Qun Liu
DOI:10.1021/jo300615t
日期:2012.6.1
regiospecific [4 + 2] cycloaddition of readily available cyclobutenones and active methylene ketones has been developed. On the basis of this strategy, persubstituted phenols/anilines with up to six different functional groups on the benzene ring were synthesized in a single step. In addition, a series of acridine derivatives were prepared in excellent yield from persubstituted phenols/anilines.
A thermally induced novel formal [4+2] cycloaddition of cyclobutenones with electron-deficient alkynes under metal-free conditions has been developed for the first time. The reaction can proceed in a highly regioselective manner and provides a straightforward and efficient method for the synthesis of 4-pyridone derivatives from readily available starting materials in a single step.