Olefination of methyl (1S,2R,4R)-N-benzoyl-2-formyl-7-azabicyclo[2.2.1]heptane-1-carboxylate, a synthetic approach to new conformationally constrained prolines
作者:Ana M. Gil、Elena Buñuel、Marı́a D. Dı́az-de-Villegas、Carlos Cativiela
DOI:10.1016/s0957-4166(03)00200-3
日期:2003.6
Wittig olefinations of methyl (1S,2R,4R)-N-benzoyl-2-formyl-7-azabicyclo[2.2.1]heptane-1-carboxylate with several phosphoranes and the Horner-Wittig reaction, using methyl diethylphosphonoacetate, have been tested in order to evaluate their utility in the synthesis of beta-substituted conformationally constrained prolines. Subsequent elaboration of the resulting alkenes has provided proline-amino acid chimeras [combinations of proline with other alpha-amino acids, such as L-norvaline, L-norleucine, L-alpha-(3-phenylpropyl)glycine or L-homoglutamic acid] with the 7-azabicyclo[2.2.1]heptane skeleton in an enantiomerically pure form. (C) 2003 Elsevier Science Ltd. All rights reserved.