Hydroxyacids as efficient chiral spacers for asymmetric intramolecular [2+2] photocycloadditions
作者:Sophie Faure、Sylvie Piva-Le Blanc、Olivier Piva、Jean-Pierre Pete
DOI:10.1016/s0040-4039(96)02499-9
日期:1997.2
An indirect and efficient enantioselective [2+2] photocycloaddition between 3-carboxycyclohex-2-enone and allyl alcohol, involving a three step sequence, is described. When the reagents are linked by covalent bonds to a chiral spacer such as L-lactic or (R)-3-hydroxybutyric acids, the corresponding photocycloadducts are isolated in high yields. with very high regio and diastereostereoselectivies. The
描述了3-羧基环己-2-烯酮和烯丙醇之间的间接和有效的对映选择性[2 + 2]光环加成,涉及三个步骤。当试剂通过共价键连接至手性间隔基(例如L-乳酸或(R)-3-羟基丁酸)时,可以高收率分离出相应的光环加合物。具有很高的区域和非对映体选择性。反应得到多官能环丁烷,为纯对映体。