Sequential Organocatalyzed Michael Addition/[3 + 2]-Heterocyclization for the Stereoselective Synthesis of Fused-Isoxazoline Precursors of Enantiopure Cyclopentanoids
作者:Damien Bonne、Lydie Salat、Jean-Pierre Dulcère、Jean Rodriguez
DOI:10.1021/ol8023133
日期:2008.12.4
We propose an asymmetric synthesis of functionalized cyclopentanoids bearing up to four stereogenic centers from easily accessible nitroalkenes and unsaturated aldehydes. The overall sequence includes an enantioselective organocatalytic Michael addition and a [3 + 2]-heterocyclization between an in situ generated silyInitronate and the unactivated double bond. Finally, the fused isoxazoline can be further transformed to various cyclopentanoids.