treatment of the 4-mercapto-azetidin-2-one (1) gave the thioaldehyde (2) which was intercepted by reduction to the peptide (5), prior to enolization; a similar sequence with the dihydro-derivative (11) provided the cysteinyl-valine peptide (7), which represents a formal reversion of penicillin biosynthesis.
对4-巯基-氮杂
环丁烷-2-酮(1)进行温和的酸处理,得到
硫代醛(2),在烯醇化之前,其被还原成肽(5)而被截留;与二氢衍
生物(11)相似的序列提供了半胱
氨酸-缬
氨酸肽(7),这代表了
青霉素生物合成的正式逆转。