Reaction Models of the Oxidative Rearrangement of Averufin to 1'- Hydroxyversicolorone: The First Step in Dihydrobisfuran Formation in Aflatoxin Biosynthesis
作者:Craig A. Townsend、Yasuo Isomura、Steven G. Davis、Julia A. Hodge
DOI:10.1016/s0040-4020(01)83431-1
日期:——
The formation of the dihydrobisfuran ring system uniquely representative of the aflatoxins among polyketide natural products is achieved in three net oxidative steps relating averufin (2) to versicolorin A (5). The first of these oxidative rearrangements carries the former to 1'-hydroxyversicolorone (3). Labeling experiments have placed several limitations on the mechanisms of reactions that can account
二氢双呋喃环系统的形成是聚酮化合物天然产物中黄曲霉毒素的唯一代表,这是通过三个净氧化步骤实现的,该步骤将阿维素(2)与维色色素A(5)关联起来。这些氧化重排中的第一个将前者携带至1'-羟基异色酮(3)。标记实验对可解释这种转化的反应机理设置了几个限制。两种可行的可能性涉及自由基或阳离子中间体,这些中间体已在基于6,8-二-O-甲基averaverin(20,X = H)的模型反应中研究了其对重排的基本反应性。