The Biosynthesis of the Benzoxazole in Nataxazole Proceeds via an Unstable Ester and has Synthetic Utility
作者:Haigang Song、Cong Rao、Zixin Deng、Yi Yu、James H. Naismith
DOI:10.1002/anie.201915685
日期:2020.4.6
through an ester generated by an ATP-dependent adenylating enzyme. The ester rearranges via a tetrahedral hemiorthoamide to yield an amide, which is a shunt product and not, as previously thought, an intermediate in the pathway. A second zinc-dependent enzyme catalyzes the formation of hemiorthoamide from the ester but, by shuttling protons, the enzyme eliminates water, a reverse hydrolysis reaction, to yield
杂环是一类包括恶唑的分子,是当前药物中最常见的结构单元之一,在重要的天然药物中也很常见。抗肿瘤天然产物萘他唑是通过未表征途径制备的大量含苯并恶唑分子的模型。我们报告结构,生化和化学证据,苯并恶唑生物合成过程通过由ATP依赖的腺苷酸化酶生成的酯进行。酯经由四面体半原甲酰胺重排以产生酰胺,该酰胺是分流产物,而不是如先前认为的通路中的中间体。第二种锌依赖性酶催化由酯形成半甲酰胺,但通过穿梭质子,该酶消除了水,逆水解反应,生成苯并恶唑并避免使用酰胺。这些见解使我们能够利用这一途径来合成一系列新型卤代苯并恶唑。