The first enantioselective variant of the phosphine-promoted [3+2] cycloaddition reaction between allenoates and 2-aryl-1,1-dicyanoethylenes has been developed. The use of (S)-t-butyl-Binepine as the chiral organocatalyst allows the synthesis of functionalized cyclopentenes with both aryl and heteroaryl substituents on the stereogenic carbon, in high yields and ees of up to 95%. (C) 2010 Elsevier Ltd. All rights reserved.
Phosphine-catalyzed one-pot synthesis of cyclopentenes from electron-deficient allene, malononitrile and aromatic aldehydes
作者:Xiyan Lu、Zheng Lu、Xumu Zhang
DOI:10.1016/j.tet.2005.09.100
日期:2006.1
A three component reaction of aryl aldehydes and malononitrile with ethyl 2,3-butadienoate catalyzed by triphenylphosphine has been developed. The reaction furnishes highly functionalized cyclopentenes in moderate to good yields in a one-pot process.