Ferric Chloride Hexahydrate-Catalyzed Highly Regio- and Stereoselective Conjugate Addition Reaction of 2,3-Allenoates with Grignard Reagents: An Efficient Synthesis of β,γ-Alkenoates
作者:Guobi Chai、Zhan Lu、Chunling Fu、Shengming Ma
DOI:10.1002/adsc.200900091
日期:2009.8
Ferric chloride hexahydrate was shown to be an efficient catalyst for the conjugate addition of 2,3-allenoates with alkyl-, aryl-, or vinyl-Grignard reagents to synthesize polysubstituted β,γ-unsaturated alkenoates with high regio- and stereoselectivity. The in situ formed magnesium dienolate may readily react with different electrophilic reagents under different reaction conditions with or without
六水合氯化铁被证明是2,3-烯丙基酸酯与烷基,芳基或乙烯基格氏试剂共轭加成以合成具有高区域和立体选择性的多取代的β,γ-不饱和烯酸酯的有效催化剂。在原位形成二烯醇镁可以容易地与具有或不具有催化剂不同的反应条件下不同亲电试剂反应以构建在酯基团的α位和碳-碳双键的stereocontrollable保留烯丙基季碳。