The thiolysis of alpha,beta-epoxycarboxylic acids la-e by thiois 2a,b is more efficient in water than in dichloromethane or SFC. At pH 9.0 phenylthiolate generally attacks the C-alpha carbon while at pH 4.0, and in the presence of InCl3 (10 mol %), the thiolysis is exclusively C-beta regioselective. In all cases, the processes are completely anti-diasteroselective, and the corresponding products 3, 4, and 5 have been isolated in good yields. Both water and catalysts have been recovered and reused.
alpha-Hydroxy-beta-amino acids were synthesized with excellent yields for the first time in water and by a simple procedure based on a copper catalytic cycle, which included the recovery and reuse of the catalyst and is possible to realize by using only water as reaction medium.
LEMMENS, J. M.;BLOMMERDE, W. W. J. M.;THIJS, L.;ZWANENBURG, B., J. ORG. CHEM., 1984, 49, N 12, 2231-2235
作者:LEMMENS, J. M.、BLOMMERDE, W. W. J. M.、THIJS, L.、ZWANENBURG, B.