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.
Highly efficient synthesis of 3-amino-/alkylthio-cyclobut-2-en-1-ones based on the cyclization of acyl ketene dithioacetals
作者:Yu-Long Zhao、Shao-Chun Yang、Chong-Hui Di、Xiao-Dan Han、Qun Liu
DOI:10.1039/c0cc02470h
日期:——
A new strategy for the highlyefficient one-pot synthesis of 3-amino-/alkylthio-cyclobut-2-en-1-ones based on the cyclization of acyl ketene dithioacetals is disclosed. In addition, the rearrangement of 3-amino-cyclobut-2-en-1-ones to 4-quinolone derivatives is described.
fully substituted 2-pyridone 2 and functionalized α-pyrones 3 are synthesized starting from cyclobutenones 1 under a base-promoter in toluene at 80 ℃. This rearrangement is complimentary to the previously reported ringexpansion of cyclobutenones, providing a divergent synthesis of corresponding products from the same precursor 1. In addition, α-pyrones 3 has also been applied to the synthesis of aromatic