Enantioselective Organocatalytic Approach to the Synthesis of α,α-Disubstituted Cyanosulfones
作者:M. Belén Cid、Jesús López-Cantarero、Sara Duce、José Luis García Ruano
DOI:10.1021/jo801968p
日期:2009.1.2
sulfones have been obtained by organocatalytic enantioselective Michael addition of α-substituted cyanosulfones to vinyl ketones using cinchona alkaloids as catalysts. The best results were obtained for p-trifluorophenylsulfones by using VIII as catalyst in toluene at −40 °C. Reactions proved to be applicable for a variety of α,β-unsaturated ketones, affording α,α-disubstituted cyanosulfones in excellent
通过使用金鸡纳生物碱作为催化剂,通过将α-取代的氰基砜有机催化对映选择性迈克尔加成到乙烯基酮上,获得了光学纯的氰基叔烷基砜。通过在-40°C的甲苯中使用VIII作为催化剂,对-三氟苯基砜获得了最佳结果。事实证明该反应适用于多种α,β-不饱和酮,以er高达90:10的高收率提供了α,α-二取代的氰基砜。