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。
An efficient synthesis of 5-aminolaevulinic acid (ALA)-containing peptides for use in photodynamic therapy
作者:Louis M.-A. Rogers、Philip G. McGivern、Anthony R. Butler、Alexander J. MacRobert、Ian M. Eggleston
DOI:10.1016/j.tet.2005.05.036
日期:2005.7
cost-effective procedure has been devised for the preparation of urethane-protected 5-aminolaevulinic acid (5-ALA) dipeptide ester derivatives which avoids problems associated with the instability of 5-ALA under basic conditions. The procedure is also applicable to the direct synthesis of N-(α)-acetyl amino acid-ALA dipeptides in highenantiomericpurity as potential novel prodrugs for photodynamic therapy
A catalytic one-step synthesis of peptide thioacids was developed. The oxygen–sulfur atom exchange reaction converted the carboxy group at the C-terminus of the peptides into a thiocarboxy group with suppressed epimerization. This method was successfully applied to the synthesis of the peptide drug leuprorelin via an iterative fragment-coupling protocol.
The synthesis of a series of opticallyactive N-acetyl butenoates 3–5 is described using a facile methodology. These butenoates undergo cyclization to the corresponding N-acetyl-2-alkyl-pyrrolin-4-ones 6,7 retaining their stereochemical integrity. The structure of the newly synthesized compounds has been elucidated through 1H-13C NMR, IR spectroscopy and their enantiomeric excesses have been measured
使用简便的方法描述了一系列光学活性的N-乙酰基丁烯酸酯3-5的合成。这些丁烯酸酯经环化成相应的N-乙酰基-2-烷基-吡咯啉-4-酮6,7,保留了它们的立体化学完整性。新合成的化合物的结构已通过1 H- 13 C NMR,IR光谱进行了阐明,其对映体过量已通过手性HPLC分析进行了测量。
AZIRIDINE MEDIATED NATIVE CHEMICAL LIGATION
申请人:Washington State University
公开号:US20130131311A1
公开(公告)日:2013-05-23
Improved methods of native chemical ligation are provided. The methods involve reacting a thioacid (e.g. a peptide thioacid) with an aziridinyl compound (e.g. an aziridinyl peptide) under mild conditions without the use of protecting groups, and without requiring that a cysteine residue be present in the ligation product. Initial coupling of the thioacid and the aziridinyl compound yields a ligation product which contains an aziridinyl ring. Subsequent opening of the aziridinyl ring (e.g. via a nucleophilic attack) produces a linearized and modified ligation product.