一系列的二肽的升-proline-升氨基磺酸和升-proline- d -氨基酸合成,以评估直接不对称醛醇缩合反应的催化效果。在直接的醛醇缩合反应中,1-脯氨酸-1-氨基酸的催化剂比相应的1-脯氨酸-d具有更好的对映选择性。-氨基酸催化剂。二肽催化剂在溶剂中的溶解度是获得更好的直接醛醇缩合反应产率的关键,而溶剂的氢键在获得更好的对映选择性和产率方面不发挥重要作用。NMM和SDS添加剂可提高水中直接羟醛反应的收率和对映选择性,但在普通DMSO中进行的结果甚至更好。
A Novel Cyanobacterial Nostocyclopeptide is a Potent Antitoxin against Microcystins
作者:Jouni Jokela、Lars Herfindal、Matti Wahlsten、Perttu Permi、Frode Selheim、Vitor Vasconçelos、Stein Ove Døskeland、Kaarina Sivonen
DOI:10.1002/cbic.201000179
日期:——
Running rings round toxins: A novelnostocyclopeptide variant, Ncp‐M1, was isolated from Nostoc. Ncp's form a unique peptide family, members of which spontaneously cyclise through an imino bond. All three Ncp variants described so far prevented the hepatotoxic action of microcystin and nodularin, which pose a threat to human health.
Shaw, I. M.; Taylor, A., Canadian Journal of Chemistry, 1986, vol. 64, p. 164 - 173
作者:Shaw, I. M.、Taylor, A.
DOI:——
日期:——
Preparation of peptides with C-terminal proline amide
申请人:SANKYO COMPANY LIMITED
公开号:EP0197794B1
公开(公告)日:1989-12-13
Combination of an aldosterone receptor antagonist and an anti-diabetic agent
申请人:Gulve Arthur Eric
公开号:US20050014732A1
公开(公告)日:2005-01-20
A combination therapy comprising a therapeutically-effective amount of an aldosterone receptor antagonist and a therapeutically-effective amount of an anti-diabetic agent is described for treatment of circulatory disorders, including cardiovascular disorders such as hypertension, congestive heart failure, cirrhosis and ascites. Preferred antidiabetic agents are those compounds having high potency and oral or parenteral bioavailability. Preferred aldosterone receptor antagonists are 20-spiroxane steroidal compounds characterized by the presence of a 9α,11α-substituted epoxy moiety.
The invention is directed to methods of converting a carboxylic acid group in a compound, via a redox active ester, to a corresponding boronic ester by treatment with bis(pinacolato)diboron-alkyllithium complex in the presence of a ligand, a Ni(II) salt or a copper salt, and an Mg(II) salt, in the presence of an alkyllithium or a lithium hydroxide or alkoxide salt. The product pinacolato boronate ester can be cleaved to provide a boronic acid. The invention is also directed to methods of preparing various compounds of medical value comprising boronic acid groups, and to novel boronic-acid containing compounds of medicinal value, including an atorvastatin boronic acid analog, a vancomycin aglycone boronic acid analog, and boronic acid containing elastase inhibitors mCBK319, mCBK320, mCBK323, and RPX-7009.