Enantiomerically pure P-chiral dicyclohexylammonium 2-(phosphinyl)acrylates as new Michael acceptors. Enantioselective synthesis of α-methylene-δ-valerolactones
摘要:
A convenient method for the preparation of enantiomerically pure P-chiral dicyclohexylammonium 2-(phosphinyl)acrylates 6 and 7 is presented. The synthesis of alpha-methylene-delta-valerolactone 5a with enantiomeric excesses of 85% and 80% has been developed. The key step of the synthesis. involves an asymmetric Michael addition of imine 10 to acrylates 6 and 7, respectively. (c) 2006 Elsevier Ltd. All rights reserved.
Enantiomerically pure P-chiral dicyclohexylammonium 2-(phosphinyl)acrylates as new Michael acceptors. Enantioselective synthesis of α-methylene-δ-valerolactones
摘要:
A convenient method for the preparation of enantiomerically pure P-chiral dicyclohexylammonium 2-(phosphinyl)acrylates 6 and 7 is presented. The synthesis of alpha-methylene-delta-valerolactone 5a with enantiomeric excesses of 85% and 80% has been developed. The key step of the synthesis. involves an asymmetric Michael addition of imine 10 to acrylates 6 and 7, respectively. (c) 2006 Elsevier Ltd. All rights reserved.