A novel series of indole-2-carboxylate analogues of GV 150526 (1) in which the propenoic double bond was substituted with different "probes" or replaced by a isosteric cyclopropyl moiety were synthesized and evaluated for their affinity profile in order to obtain further information on the pharmacophoric model of the glycine binding site associated to the NMDA receptor.
Enantioselective Horner–Wadsworth–Emmons reaction for the asymmetric synthesis of α-fluoro-α,β-unsaturated esters
The enantioselective Horner-Wadsworth-Emmons reaction of 2-fluoro-2-dietliylphosphonoacetates with sigma-symmetric prochiral 2-substituted-1,3-dioxan-5-ones and 4-substituted-cyclohexanones was investigated by employing Sn(OSO2CF3)(2) and N-ethylpiperidine in the presence of an external chiral ligand, (S)-(-)-1-methyl-2-(1-piperidinomethyl)pyrrolidine. A chiral alpha-fluoro-alpha,beta-unsaturated ester was obtained in up to 80% ce. (C) 2002 Elsevier Science Ltd. All rights reserved.