Phosphine-Triggered Tandem Annulation between Morita–Baylis–Hillman Carbonates and Dinucleophiles: Facile Syntheses of Oxazepanes, Thiazepanes, and Diazepanes
作者:Rong Zhou、Jianfang Wang、Chong Duan、Zhengjie He
DOI:10.1021/ol302696e
日期:2012.12.21
A new phosphine-triggered tandem [3 + 4] annulation reaction between Morita–Baylis–Hillman carbonates and 1,4-diheteroatom dinucleophiles has been developed, which provides a facile synthetic method for saturated seven-membered 1,4-heterocycles such as 1,4-oxazepanes, 1,4-thiazepanes, and 1,4-diazepanes. Mechanistic investigation implies that this reaction takes place through a phosphine-catalyzed
Morita–Baylis–Hillman碳酸盐与1,4-二杂原子双亲核试剂之间进行了新的膦触发的串联[3 + 4]环化反应,这为饱和的七元1,4-杂环(如1)提供了一种简便的合成方法。 ,4-氧杂庚酮,1,4-噻庚烷和1,4-二氮杂庚烷。机理研究表明该反应是通过膦催化的烯丙基烷基化反应,然后进行一般的碱催化的分子内迈克尔环化反应而发生的。