Synthesis of (3<i>S</i>,5<i>R</i>)-Carbapenam-3-carboxylic Acid and Its Role in Carbapenem Biosynthesis and the Stereoinversion Problem
作者:Anthony Stapon、Rongfeng Li、Craig A. Townsend
DOI:10.1021/ja037665w
日期:2003.12.1
(5R)-Carbapenem-3-carboxylic acid is the simplest structurally among the naturally occurring carbapenem beta-lactam antibiotics. It is the produced from (3S,5S)-carbapenam-3-carboxylic acid utilizing a remarkable stereoinversion/desaturation process by CarC (carbapenem synthase), an alpha-ketoglutarate dependent non-heme iron oxygenase. In this communication, we demonstrate for the first time that
(5R)-Carbapenem-3-羧酸是天然存在的碳青霉烯β-内酰胺类抗生素中结构最简单的。它是由 (3S,5S)-碳青霉烯-3-羧酸通过 CarC(碳青霉烯合酶)(一种α-酮戊二酸依赖性非血红素铁加氧酶)的显着立体反转/去饱和过程产生的。在本次交流中,我们首次证明差向异构 (3S,5R)-碳青霉烯-3-羧酸是碳青霉烯类抗生素整个催化循环中的中间体。α-酮戊二酸在立体反转和去饱和过程中的作用也进行了检查。