Design and synthesis of chromogenic thiopeptolide substrates as MetAPs active site probes
作者:Yong-Mei Cui、Jing-Ya Li、Ling-Ling Chen、Jia Li、Qi-Zhuang Ye、Fa-Jun Nan
DOI:10.1016/j.bmc.2004.03.044
日期:2004.6
Twenty one chromogenic thiopeptolide substrates were designed and synthesized as the active site probes and analyzed with each S1 site of mutant residues and enzymes of wild-type MetAP1s. The preliminary enzymatic experiments indicate that cysteine 70 or 202, at either Escherichia coli or human MetAP1, played a crucial role in the methionine hydrolysis.
Umwandlung von Aldehyden in 2-monosubstituierte Aziridine. Reduktion von α-Chlor, Brom- und Sulfonyloxynitilen mit Lithiumaluminiumhydrid
作者:Kunihiro Ichimura、Masaki Ohta
DOI:10.1246/bcsj.43.1443
日期:1970.5
The reductive cyclization of α-chloro, bromo- and sulfonyloxycarbonitriles are described. α-Chlorocarbonitriles were reduced by lithium aluminum hydride to afford aziridines in sufficient yields. The Walden inversion was found to take place in the cource of the reductive cyclization of S-α-chloroisocapronitrile. We have found the two-step conversion of aldehydes to 2-mono-substituted aziridines which
Provision of a superior URAT1 activity inhibitor effective for the treatment and the like of a pathology involving uric acid, such as hyperuricemia, gouty tophus, acute gouty arthritis, chronic gouty arthritis, gouty kidney, urinary lithiasis, renal dysfunction, coronary heart disease, ischemic cardiac diseases and the like.
A URAT1 activity inhibitor containing a compound represented by the following formula [1] or a pharmaceutically acceptable salt thereof, or a solvate thereof as an active ingredient:
wherein each symbol is as defined in the specification.
N-Acetylmuramyl-L-alanyl-D-isoglutamine (MDP) and thirteen new analogs were synthesized by the conventional organic chemical procedure using dicyclohexylcarbodiimide-N-hydroxy-5-norbornene-2,3-dicarboximide as a coupling agent. Their ability to induce delayed-type hypersensitivity to N-acetyl-3-(4-arsonophenylazo)-L-tyrosine in guinea pigs was assayed. The results indicate that the presence of an α-amino
2-chloro-alkanoic acids 6 and 7 have been obtained the diastereoselective halogenation of chiralsilylketeneacetals 3a-f, and subsequent saponification of the resulting crude esters. Examples characterized by e.e. values up to 95% are reported. The diastereoface selectivity is independent of the silylketeneacetal configuration.