Thiazole derivatives which are angiotensin II receptor antagonists,
申请人:Laboratoires UPSA
公开号:US05192781A1
公开(公告)日:1993-03-09
The present invention relates to the derivatives of formula (I): ##STR1## and their addition salts, and to their use in therapeutics, especially for the treatment of cardiovascular diseases and in particular for the treatment of hypertension and cardiac insufficiency.
Solvent-free rapid coupling of monothiocarboxylic acid with azide affords carboxamide chemoselectively. Triphenyl phosphine included as an additive influences the chemoselectivity, yielding carboxamide and thioamide. Similar variation in the chemoselectivity is observed in the absence and presence of triphenyl phosphine in solution-phase methodology. Rapidity and ecofriendliness of the solvent-free approach to yield the products in just 15 min is noteworthy compared to the solution-phase protocol, which has a long reaction time (1-3 days).
A new method for peptide synthesis in the N→C direction: amide assembly through silver-promoted reaction of thioamides
作者:Aysa Pourvali、James R. Cochrane、Craig A. Hutton
DOI:10.1039/c4cc07601j
日期:——
The Ag(I)-promoted coupling of amino acids and peptides with amino ester thioamides generates peptide imides without epimerisation. The peptide imides undergo regioselective hydrolysis under mild conditions to generate native peptides. This method was employed to prepare the pentapeptide thymopentin in the N-->C direction, in high yield and purity.