[4+2] Annulation - Convenient Synthesis of Substituted Dihydropyranones in Aqueous Media
作者:Yan Ouyang、Jie Huang、Wei Pan、Yongjiu Liang、Yang Yang、Dewen Dong
DOI:10.1002/ejoc.200801257
日期:——
A facile and convenient synthesis of dihydropyranones has been developed by a formal [4+2] annulation of readily available alpha-acetyl ketene S,S-acetals with various aldehydes, involving a tandem aldol reaction and conjugate addition-elimination reaction, in the presence of NaOH in water.
通过将容易获得的 α-乙酰基烯酮 S,S-缩醛与各种醛进行正式的 [4+2] 环化,开发了一种简单方便的二氢吡喃酮合成方法,涉及串联醛醇反应和共轭加成消除反应,在存在下NaOH 水溶液。