Highly efficient polymer supported phase-transfer catalysts containing hydrogen bond inducing functional groups
摘要:
Merrifield resin supported cinchona ammonium salts bearing 2'-fluorobenzene, 2'-cyanobenzene and 2'-N-oxypyridine groups were prepared and applied to the phase-transfer catalytic alkylation of N-(diphenylmethylene)glycine tert-butyl ester for the enantioselective synthesis of alpha-amino acids (76-96% ee). (c) 2008 Elsevier Ltd. All rights reserved.