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