Dipeptide compounds and compounds analogous to dipeptide compounds that are formed from an amino acid and a thiazolidine or pyrrolidine group and salts thereof used in the treatment of impaired glucose tolerance, glycosuria, hyperlipidaemia, metabolic acidoses, diabetes mellitus, diabetic neuropathy and nephropathy and also of sequelae of diabetes mellitus in mammals.
process for the preparation of optically-active cyanomethyl esters
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0109681A2
公开(公告)日:1984-05-30
Stereoisomerically-enriched cyanomethyl esters are prepared by treating a non-symmetrical ketene or an alpha-chiral carboxylic acid halide or reactive derivative thereof with an optically-active alphahydroxynitrile. Certain optically-active optionally substituted S-alphacyano-3-phenoxybenzyl alcohol intermediates are prepared by treating the corresponding aldehyde of ketone with a source of hydrogen cyanide in the presence of a substantially water-immiscible, aprotic solvent and a cyclo(D-phenylalanyl-D-histidine) as a catalyst.
Preparation of optically-active alpha-substituted carboxylic esters and acids
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0116914A1
公开(公告)日:1984-08-29
Optically-active alpha-substituted carboxylic esters are prepared by treating a non-symmetrical ketene with an alcohol in the presence of an optically-active amine catalyst. Hydrolysis of the resulting esters, yields the optically-active acid corresponding to the non-symmetrical ketene.
Process for the preparation of optically-active cyanomethyl esters
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0291626A2
公开(公告)日:1988-11-23
Stereoisomerically-enriched cyanomethyl esters are prepared by treating a non-symmetrical ketene or an alpha-chiral carboxylic acid halide or reactive derivative thereof with an optically-active alpha-hydroxynitrile. Certain optically-active optionally substituted S-alpha-cyano-3-phenoxybenzyl alcohol intermediates are prepared by treating the corresponding aldehyde or ketone with a source of hydrogen cyanide in the presence of a substantially water-immiscible, aprotic solvent and a cyclo(D-phenylalanyl-D-histidine) as a catalyst.
A method of assessing the quality of a biological sample while maintaining the viability of the biological sample for intended use analysis is described herein. The method includes analyzing a biological sample obtained from a subject for an intended use, assessing the quality of the biological sample using one or more biomarkers of sample quality, and simultaneously performing intended use analysis on the same sample. Assessing the quality of the sample can include assessing compliance with sample handling protocols and assessing subject compliance.