Fragments of the thiopeptide antibiotic MDL 62,879 (GE2270A) were prepared under mild degradation conditions. Their structures were determined by spectroscopic techniques and by comparison to synthetic reference thiazolyl dipeptides. The two thiazolyl amino acids have stereocenters with S configurations and their sequence is reversed with respect to the structure previously proposed for MDL 62,879
Substances and Pharmaceutical Compositions for the Inhibition of Glyoxalases and Their Use As Anti-Fungal Agents
申请人:Huse Klaus
公开号:US20080300303A1
公开(公告)日:2008-12-04
The present invention pertains to substances of the formula (I) wherein X is O or S; and R1-R4 are defined in the claims as inhibitors of glyoxalase I and/or II, pharmaceutical compositions comprising one or more compounds according to formula (I) and the use of one or more compounds according to formula (I) for the treatment of diseases associated with increased glycolytic metabolism. In one embodiment, the disease is a fungal infection.
The present invention is directed to a method for purifying pyruvic acid compounds, which method comprises reacting a pyruvic acid compound of general formula (I):
wherein R1 is an optionally substituted lower alkyl group, a lower alkenyl group, a lower alkynyl group, a cycloalkyl group, an aryl group, or a heterocyclic group, and R2 is a lower alkyl group, with a bisulfite of general formula (II):
MHSO3 (II)
wherein M is NH4 or an alkali metal, to give a bisulfite adduct of the pyruvic acid compound and then decomposing the adduct with an acid. According to the present invention, pyruvic acid compounds can be purified by simple and easy procedures without using purification techniques such as distillation or column chromatography, and the above method is advantageous as a process for the production on an industrial scale.
本发明涉及一种纯化丙酮酸化合物的方法,该方法包括使通式(I)的丙酮酸化合物反应:
其中 R1 是任选取代的低级烷基、低级烯基、低级炔基、环烷基、芳基或杂环基,R2 是低级烷基,与通式(II)的亚硫酸氢盐反应:
MHSO3 (II)
其中 M 为 NH4 或碱金属,以得到丙酮酸化合物的亚硫酸氢盐加合物,然后用酸分解该加合物。根据本发明,丙酮酸化合物可以通过简单易行的程序进行纯化,而无需使用蒸馏或柱层析等纯化技术,上述方法作为一种工业规模的生产工艺是非常有利的。
Asymmetric multicomponent reactions: convenient access to acyclic stereocenters and functionalized cyclopentenoids
作者:Arun K. Ghosh、Sarang S. Kulkarni、Chun-Xiao Xu、Khriesto Shurrush
DOI:10.1016/j.tetasy.2008.04.005
日期:2008.5
Asymmetric multicomponent reactions of optically active phenyl dihydrofuran, keto ester or N-tosyl imino ester, and allylsilane provided functionalized phenyl tetrahydrofurans with multiple stereogenic centers diastereoselectively. Cleavage of the resulting substituted tetrahydrofurans readily provided acyclic derivatives with three contiguous asymmetric centers via an acyloxycarbenium ion intermediate. Ring closing olefin metathesis, using Grubbs catalyst, afforded functionalized cyclopentene derivatives in optically active form. A one-pot tandem tetrahydrofuran ring cleavage followed by ring closing olefin metathesis also provided functionalized cyclopentenes in good yield. (C) 2008 Elsevier Ltd. All rights reserved.
SUBSTANCES AND PHARMACEUTICAL COMPOSITIONS FOR THE INHIBITION OF GLYOXALASES AND THEIR USE AS ANTI-FUNGAL AGENTS
申请人:Biomac Privatinstitut für medizinische und
Zahnmedizinische Forschung, Entwicklung
und Diagnostik GmbH