Enantioselective [4 + 2]-Annulation of Oxadienes and Allenones Catalyzed by an Amino Acid Derived Phosphine: Synthesis of Functionalized Dihydropyrans
作者:Huanzhen Ni、Weijun Yao、Abdul Waheed、Nisar Ullah、Yixin Lu
DOI:10.1021/acs.orglett.6b00760
日期:2016.5.6
An enantioselective [4 + 2]-annulation process between cyano-activated oxadienes and allenones is developed. An l-valine-derived phosphine was efficient in catalyzing the reaction, and a wide range of highly functionalized dihydropyrans were prepared in high yields and with excellent enantioselectivities.