An Efficient Synthesis of 3,4-Dihydropyran-2-one Derivatives by Lewis Base-catalyzed Tandem Michael Addition and Lactonization
作者:Takashi Tozawa、Hidehiko Fujisawa、Teruaki Mukaiyama
DOI:10.1246/cl.2004.1454
日期:2004.11
A convenient one-pot preparation of 3,4-dihydropyran-2-one derivatives by Michael addition of silyl enolate derived from phenyl ester with α,β-unsaturated ketones in the presence of a Lewis base catalyst such as tetrabutylammonium phenoxide was developed. In this catalytic cycle, 3,4-dihydropyran-2-ones were produced in good to excellent yields via intramolecular cyclization of in situ formed Michael-adducts.
在路易斯碱催化剂(如四丁基氧化铵)的作用下,开发了一种简便的单锅制备 3,4-二氢吡喃-2-酮衍生物的方法,该方法是通过苯基酯衍生的硅烷基烯醇与 α,β-不饱和酮进行迈克尔加成。在这一催化循环中,通过原位形成的迈克尔加成物的分子内环化,3,4-二氢吡喃-2-酮以良好至极佳的收率生成。