�ber die Geschwindigkeit der Aminolyse von verschiedenen neuen, aktivierten, N-gesch�tzten ?-Aminos�ure-phenylestern, insbesondere 2,4,5-Trichlorphenylestern
作者:J. Pless、R. A. Boissonnas
DOI:10.1002/hlca.19630460516
日期:——
A comparison of the ate of aminolysis of many substituted phenyl esters of N-protected α-amino-acids shows that the 2,4,5-trichlorophenyl esters are promising new active derivatives for the synthesis of peptides.
Novel esterifying agents, and their production and use
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US03976635A1
公开(公告)日:1976-08-24
A process for esterifying organic carboxylic acids which comprises reacting an organic carboxylic acid with a carbonic acid ester of the formula: ##EQU1## wherein R is an organic group and X and Y are each a negative group in the presence of a basic substance to make esterified the carboxyl group in the organic carboxylic acid. The process is advantageous in affording the objective carboxylic ester in a good yield within a short time by a simple operation under a mild reaction condition.
Pepstatin analogues corresponding to the general formula A-X-Y-Sta-Ala-Sta-R were synthesized in solution phase. Various changes in the nature of the A, X, and Y groups were made to improve the inhibitory potency against human plasma renin activity. The results were interpreted by use of the active-site model based on the sequence of human angiotensinogen. The tert-butyloxycarbonyl group and the isovaleryl
在溶液相中合成对应于通式AXY-Sta-Ala-Sta-R的胃抑素类似物。进行了A,X和Y基团性质的各种变化以提高对人血浆肾素活性的抑制能力。通过使用基于人类血管紧张素原序列的活性位点模型来解释结果。发现叔丁氧羰基和异戊酰基是最有效的酰基(A)。在Y位置具有Phe残基代替Val1(X)和His或具有脂肪族侧链的氨基酸(如正亮氨酸或正缬氨酸)的类似物显示出对人血浆肾素活性的最高抑制作用,IC50值约为10(-8) M. C-末端他汀类化合物的羧基的酯化或酰胺化不会改变抑制能力。
The Trifluoroacetate Method of Peptide Synthesis. I. The Synthesis and Use of Trifluoroacetate Reagents
作者:Shumpei Sakakibara、Noriyoshi Inukai
DOI:10.1246/bcsj.38.1979
日期:1965.11
thiophenol and N-hydroxyimide derivatives, which are known as hydroxylic partners of various active carboxylic acid ester, have been synthesized, and it has been found that they are good reagents for the preparation of the respective active esters of acylamino acids by the ester-exchange reaction in pyridine. The new method is especially effective in the preparation of p-nitrophenyl, 2,4,5-trichlorophenyl