The combination of domino process and kinetic resolution: organocatalytic synthesis of functionalised cyclopentenes by sequential SN2′-Michael reaction
作者:Lun Fu Yeh、Shaik Anwar、Kwunmin Chen
DOI:10.1016/j.tet.2012.06.085
日期:2012.9
An interesting combination of organocatalytic cascade reaction and kinetic resolution was developed for the synthesis of functionalised cyclopentenes by sequential S(N)2'-Michael process. Treatment of the racemic nitroallylic acetates with glutaraldehyde in the presence of diphenylprolinol silyl ether to give tetrasubstituted cyclopentenes with high to excellent stereoselectivities (up to 96% ee and 12:1 dr). The less reactive enantiomeric substrates were generally recovered with good to excellent optical purities (up to 99% ee). (C) 2012 Published by Elsevier Ltd.