Amino-acids and peptides. Part XXIX. The use of S-benzylthiomethyl-L-cysteine in peptide synthesis: synthesis of glutathione and homoglutathione
作者:R. Camble、R. Purkayastha、G. T. Young
DOI:10.1039/j39680001219
日期:——
The usefulness of benzylthiomethyl as an S-protecting group has been further confirmed by the synthesis of glutathione and ‘homoglutathione’(γ-L-glutamyl-L-cysteinyl-β-alanine). The benzylthiomethyl group was completely stable during the syntheses, and in the final stage was removed cleanly under the standard conditions to give quantitative or near-quantitative yields of glutathione and homoglutathione
Convenient preparations of t-butyl esters and ethers from t-butanol
作者:Stephen W. Wright、David L. Hageman、Ann S. Wright、Lester D. McClure
DOI:10.1016/s0040-4039(97)01792-9
日期:1997.10
A one-pot preparation of t-butylesters and ethers is described that proceeds from the carboxylic acid or alcohol and t-butanol using only anhydrous magnesium sulfate and catalytic sulfuric acid as additional reagents. The method affords t-butylesters and ethers in good yields and is applicable to a variety of substrates.
Process for preparing haptens for immunoassay of phosphorothioate pesticides
申请人:Lee Yong-Tae
公开号:US20050033038A1
公开(公告)日:2005-02-10
The present invention relates to a process for preparing haptens for immunoassay of phosphorothioate pesticides, which comprises the steps of reacting O-methyl(ethyl) dichlorothiophosphate with a phenolic compound to obtain O-methyl(ethyl) O-aryl chlorothiophosphate, and reacting the O-(methyl)ethyl O-aryl chlorothiophosphate thus obtained with aminocarboxylic acid to give desired haptens. In accordance with the present invention, haptens having a structure of O-methyl(ethyl) O-aryl, N-(carboxyalkyl)phosphoramidothioate or O-methyl(ethyl) O-aryl N-alkyl-N-(carboxyalkyl)phosphoramidothioate can be simply prepared with a high yield by employing two-step processes in a cost-efficient manner.
Substituted azetidinones as anti-inflammatory and antidegenerative agents
申请人:MERCK & CO. INC.
公开号:EP0525973A2
公开(公告)日:1993-02-03
New substituted azetidinones of the general formula (I) which have been found to be potent elastase inhibitors and thereby useful anti-inflammatory and antidegenerative agents are described.