Isolation of dihydroclavaminic acid, an intermediate in the biosynthesis of clavulanic acid
作者:Jack E. Baldwin、Robert M. Adlington、Justin S. Bryans、Alain O. Bringhen、Janice B. Coates、Nicholas P. Crouch、Matthew D. Lloyd、Christopher J. Schofield、Stephen W. Elson、Keith H. Baggaley、Robert Cassels、Neville Nicholson
DOI:10.1016/s0040-4020(01)86446-2
日期:1991.1
A primary isotope effect was utilised in an in vitro study to allow the isolation and characterisation of an intermediate between proclavaminic acid and clavaminic acid, in clavulanicacidbiosynthesis. 1
在体外研究中利用了主要的同位素效应,从而在棒酸的生物合成中分离和表征了原蛋白和酸之间的中间体。1个
Suppressed β-Effect of Silicon in 3-Silylated Monocyclic β-Lactams: The Role of Antiaromaticity
β-stabilizing effect of silicon substituent at C-3 on a C-4 cation and a radical in the 2-azetidinone systems is studied using NMR kinetics. While the β-effect is virtually nonexistent in the case of a cation, a foiled β-effect (only a 3-fold rate enhancement) is observed for a radical intermediate. From both the experimental and theoretical studies, it is demonstrated that antiaromaticity is playing
Novel clavam derivatives and methods of making same
申请人:Beecham Group plc
公开号:US04795809A1
公开(公告)日:1989-01-03
A compound having the formula (I): ##STR1## is described, together with salts thereof and an enzymatic process for converting such compounds into clavulanic acid. A process for the preparation of the compound of formula (I) and its salts is disclosed, together with intermediates for use therein. This process involves the use of a novel enzyme system to effect the desired cyclization, which enzyme system is preferably derived from a micro-organism, in particular a species of Streptomyces.
Isolation of an intermediate in clavulanic acid biosynthesis
作者:Jack E. Baldwin、Robert M. Adlington、Justin S. Bryans、Alain O. Bringhen、Janice B. Coates、Nicholas P. Crouch、Matthew D. Lloyd、Christopher J. Schofield、Stephen W. Elson、Keith H. Baggaley、Robert Cassells、Neville Nicholson
DOI:10.1039/c39900000617
日期:——
The operation of a primary isotope effect was utilised to enable a hitherto unknown intermediate in clavulanicacidbiosynthesis to be isolated and characterised.
利用主要同位素效应的操作,可以分离和表征棒酸生物合成中迄今未知的中间体。
Synthesis of the novel monocyclic β-lactam proclavaminic acid
作者:Keith H. Baggaley、John T. Sime、Neville H. Nicholson、Stephen W. Elson、Janet Gillett、Susan Holland、Stefan R. Woroniecki
DOI:10.1039/c39870001738
日期:——
Proclavaminicacid has been chemically synthesised and one pure enantiomer separated which was shown to possess identical physicochemical and biochemical properties to the natural material isolated from Streptomyces clavuligerus.