Allyl Sulfones as Precursors to Allylzincs in the Palladium-Catalyzed Zinc-ene Cyclization: Highly Efficient Synthesis of Enantiopure (−)-Erythrodiene
作者:Kai Deng、Justin Chalker、Ao Yang、Theodore Cohen
DOI:10.1021/ol051049i
日期:2005.8.1
Easily prepared allyl phenyl sulfones, capable of introduction of the alkene by electrophilic alpha-substitution, are superior to allyl acetates as substrates for Pd-catalyzed Zn-ene cyclizations, providing C5 or C(4)N rings with cis-1,2-vinyl and -CH(2)Zn substituents. Several examples, with different methods of substrate preparation, are presented. [reaction: see text]
易于制备的烯丙基苯基砜能够通过亲电α取代引入烯烃,优于乙酸烯丙酯作为Pd催化的Zn-烯环化的底物,提供具有顺式1,2-环的C5或C(4)N环。乙烯基和-CH(2)Zn取代基。提出了几种具有不同底物制备方法的实例。[反应:看文字]