作者:Rujee K. Duke、Mary Chebib、David E. Hibbs、Kenneth N. Mewett、Graham A.R. Johnston
DOI:10.1016/j.tetasy.2004.04.002
日期:2004.6
E-4-Amino-2-methylbut-2-enoic acid, (+/-)-4-amino-2-methylbutanoic acid, (+)-(S)- and (-)-(R)-4-amino-2-methylbutanoic acid, which are analogues of the inhibitory neurotransmitter GABA (gamma-aminobutyric acid, 4-aminobutanoic acid), were synthesised from ethyl 2-methyl-4-phthalimidobut-2-enoate, ethyl 2-methyl-4-phthilimidobutanoate, (+)+2R-(3,3-dimethylbutyro-1,4-lactonyl)]-(2S)-methyl-4-phthalimidobutanoate and (-)-[(2R-(3,3-dimethylbutyro-1,4-lactonyl)]-(2R)-methyl-4-phthalimidobutanoate, respectively. The assignment of the absolute configuration of (+)-(S)- and (-)-(R)-4-amino-2-methylbutanoic acid was based on the X-ray crystallographic structure of the (+)-(R,S)-diastereoisomer, and direct comparison of specific rotations with the published data for (-)-(R)-4-amino-2-methylbutanoic acid. (C) 2004 Elsevier Ltd. All rights reserved.