Crystal structure, computational studies, and stereoselectivity in the synthesis of 2-aryl-thiazolidine-4-carboxylic acids via <i>in situ</i> imine intermediate
作者:Rohidas M. Jagtap、Masood A. Rizvi、Yuvraj B. Dangat、Satish K. Pardeshi
DOI:10.1080/17415993.2016.1156116
日期:2016.7.3
and diastereomeric excess (de%) have been investigated. A plausible mechanism for stereoselectivity via an in situ imine intermediate is proposed using real-time IR monitoring of the synthetic reaction based on the significant signals at 1597, 1593 cm−1 for imine (C=N) stretching. The imine mechanism for stereoselectivity was further supported by NMR studies of azomethine 13C NMR signals at 159, 160 δ ppm
New aspects of the formation of 2-substituted thiazolidine-4-carboxylic acids and their thiohydantoin derivatives
作者:Ahmed R. E. Mahdy、Elghareeb E. Elboray、Ragab F. Fandy、Hussien H. Abbas-Temirek、Moustafa F. Aly
DOI:10.24820/ark.5550190.p009.861
日期:——
readily with (R)-cysteine in boiling acidified methanol to give diastereomeric mixtures of the corresponding 2-(aryl substituted) thiazolidine-4-carboxylicacids. 4-Nitrobenzaldehyde under similar conditions afforded one isomer of 2-(4-nitrophenyl)thiazolidine-4-carboxylicacid, which epimerized in the NMR solvents into a diastereomeric mixture. 2-Nitrobenzaldehyde reacted with (R)-cysteine to afford 3
is synthesized via cysteine, an amino acid found only in limited amounts in cells because of its neurotoxicity. Thus, to ensure an efficient GSH synthesis in case of an oxidative stress, cysteine should be provided extracellularly. Yet, given its nucleophilic properties and its rapid conversion into cystine, its corresponding disulfide, cysteine presents some toxicity and therefore is usually supplemented