Enantioselective total syntheses and determination of absolute configuration of marine toxins, oxazinins
作者:Dattatraya H. Dethe、Alok Ranjan
DOI:10.1039/c3ra44631j
日期:——
The enantioselective total syntheses of natural marine toxins, oxazinin-1, -2, -4, -5, -6 and linear precursor preoxazinin-7 are described. The synthetic highlights include Sharpless asymmetric aminohydroxylation and dihydroxylation, oxa-Michael reaction and intramolecular diastereoselective addition of an appropriate hydroxyl substituent to a 3-methyleneindolenine for the construction of the morpholine
描述了天然海洋毒素 oxazinin-1、-2、-4、-5、-6 和线性前体 preoxazinin-7 的对映选择性全合成。合成的亮点包括 Sharpless 不对称氨基羟基化和二羟基化、oxa-Michael 反应和分子内非对映选择性加成适当的羟基取代基到 3-亚甲基二氢吲哚,作为构建吗啉环的关键步骤。该合成路线还允许合成 1980 年从海兔 Bursatella leachii pleii 及其差向异构体中分离出的表前恶嗪和结构相关的次级代谢物 bursatellin。