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 enantioselectiveMichaeladdition of α-substituted cyanosulfones to vinyl ketones using cinchonaalkaloids 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-unsaturatedketones, affording α,α-disubstituted cyanosulfones in excellent