showed good performance in enantioselectiveintramolecular Rauhut–Currier reaction of bis(enones), giving the corresponding products in good yield with up to 98% ee. Moreover, with amino acid derived amide-phosphine B3, optically active α-methylene-δ-valerolactone was obtained in 88% yield and > 99.9% ee utilizing the enantioselectiveintramolecular Rauhut-Currier reaction of chalcone derivative.
Enantioselective Rauhut−Currier Reactions Promoted by Protected Cysteine
作者:Carrie E. Aroyan、Scott J. Miller
DOI:10.1021/ja067139f
日期:2007.1.1
We report highly enantioselective examples of the Rauhut-Currier cycloisomerization reaction (the "vinylogous Morita-Baylis-Hillman reaction"). The reaction is highly practical and is catalyzed by a commercially available derivative of the proteinogenic amino acid cysteine. Reactions are conducted in the presence of potassium tert-butoxide and a critical concentration of water in bulk acetonitrile. A mechanistic model is advanced that may account for reaction selectivity that is predicated on organizational chelation of K ion in the product-determining step in which the Cys derivative undergoes limination.