Asymmetric organocatalytic Michael-type reaction of phosphorus ylides to nitroolefins: synthesis of γ-nitro-β-aryl-α-methylene carboxylic esters
作者:Suresh Allu、Sermadurai Selvakumar、Vinod K. Singh
DOI:10.1016/j.tetlet.2009.11.063
日期:2010.1
We report, for the first time, asymmetric organocatalytic Michael-type addition of stabilized phosphorus ylides to nitroolefins mediated by bisthiourea catalyst. Its subsequent reaction with formaldehyde provides γ-nitro-α-methylene carboxylicesters in moderate to good yields and enantioselectivities (up to 63% ee).