SYNTHESIS OFC2-SYMMETRIC BISTHIAZOLIDINE LIGANDS DERIVED FROM L-CYSTEINE
摘要:
Treatment of L-cysteine esters and thiazolidine-4-carboxylic esters with an excess of paraformaldehyde in the presence of trifluoroacetic acid provides C-2-symmetric N,N'-methylenebisthiazolidines in good yield.
New Dipeptides Containing Thiazolidine-4-carboxylic Acid Derivatives: Synthesis and Characterization Using NMR Techniques and X-Ray Data.
作者:Nadia PELLEGRINI、Bernard REFOUVELET、Gregorio CRINI、Olivier BLACQUE、Marek M. KUBICKI、Jean-Francois ROBERT
DOI:10.1248/cpb.47.950
日期:——
New dipeptides, structural analogues of known immunomodulating agents, were prepared by stereospecific condensation between 2-substituted thiazolidine-4-carboxylate esters with N-substituted L-proline or L-thiaproline. The structure of these compounds has been elucidated by combination of NMR methods and X-ray analysis. In addition, NMR measurements on dipeptides indicated the presence of S-cis and S-trans conformers around the amide bonds.
Synthesis and stereochemical studies of 2-substituted thiazolidine-4-carboxamide derivatives
作者:Bernard Refouvelet、Nadia Pellegrini、Jean-François Robert、Gregorio Crini、Olivier Blacque、Marek M. Kubicki
DOI:10.1002/jhet.5570370604
日期:2000.11
A series of new2-substituted thiazolidine-4-carboxamide derivatives which have potentially useful immunological properties, have been synthesized in a stereoselective manner by coupling 2-subsituted thiazolidine-4-carboxylicacids with amines or amino esters. The structure of these compounds was established by combination of NMR methods and by X-ray analysis.
Protected derivatives of (R)-cysteine and (R)-cysteinol
作者:Asensio González、Rodolfo Lavilla、Juan F. Piniella、Angel Alvarez-Larena
DOI:10.1016/0040-4020(95)00032-4
日期:1995.3
The synthesis of N, O, S protected forms of (R)-cysteine and (R)-cysteinol as bicyclic derivatives is described. The reactivity and the preparation of substituted derivatives of these systems is also discussed.
Synthesis and structural study of piperazine-2,5-diones derived from (R)-cysteine
作者:Asensio González、Svetlana L. Vorob́eva、Ana Linares
DOI:10.1016/0957-4166(95)00168-o
日期:1995.6
Coupling Leuch's anhydrides obtained from (R)-thiazolidine-4-carboxylic acids 1 and 3 with one equivalent of the corresponding ethyl ester derivative of 1 or 3, leads to the formation of chiral piperazine-2,5-diones 2, 4, 5, 6, and 7, on thermal treatment of the intermediate dipeptides. The configuration of the products was established by nOe experiments.