Squaramide-catalyzed diastereo- and enantioselective Michael addition of 3-substituted oxindoles to nitroalkenes
作者:Wen Yang、Jingsi Wang、Da-Ming Du
DOI:10.1016/j.tetasy.2012.06.018
日期:2012.7
An efficient diastereo- and enantioselective Michael addition of 3-substituted oxindoles onto nitroalkenes catalyzed by a bifunctional chiral squaramide catalyst has been developed. This organocatalytic reaction with 2 mol % of catalyst proceeded smoothly to afford 3,3-disubstituted oxindoles in high yields with good diastereoselectivities and enantioselectivities (up to 98:2 dr, 88% ee).
已经开发了在双官能手性方酰胺催化剂催化下的3-取代的羟吲哚到硝基烯烃上的高效非对映和对映选择性迈克尔加成反应。该有机催化与2摩尔%的催化剂的反应顺利进行,以高收率提供了3,3-二取代的羟吲哚,具有良好的非对映选择性和对映选择性(最高98:2 dr,88%ee)。