Efficient organocatalytic asymmetric synthesis of 2-amino-4H-chromene-3-carbonitrile derivatives
作者:Yu Gao、Wen Yang、Da-Ming Du
DOI:10.1016/j.tetasy.2012.02.019
日期:2012.3
enantioselective tandem Michael addition–cyclization of malononitrile to nitroalkenes for the direct synthesis of chiral 2-amino-4H-chromene-3-carbonitrile derivatives was investigated. Good yields and enantioselectivities (up to 91% ee) were achieved. This organocatalytic asymmetric tandem Michael addition–cyclization provides an efficient routetoward the synthesis of optically active functionalized chromenes