Directed Hydrogenations and an Ireland-Claisen Rearrangement Linked to Evans-Tishchenko Chemistry: The Highly Efficient Total Synthesis of the Marine Cyclodepsipeptide Doliculide
作者:Tao Chen、Karl-Heinz Altmann
DOI:10.1002/chem.201501252
日期:2015.6.1
Two new convergent total syntheses have been developed for the cytotoxic, actin microfilament‐stabilizing marine cyclodepsipeptide doliculide (1). A key strategic element of both routes is the establishment of the central stereogenic center of the characteristic polydeoxypropionate stereotriad by means of a hydroxyl‐directed catalytic hydrogenation of a trisubstituted double bond. The requisite olefin
已经开发出两种新的收敛的总合成物,用于稳定细胞毒性,稳定肌动蛋白的微丝海洋环二肽多立肽(1)。两条途径的关键战略要素是通过羟基取代的三取代双键催化氢化作用,建立特征性聚脱氧丙酸酯立体三联体的中心立体中心。所需的烯烃底物分别通过改良的Suzuki-Miyaura偶联或通过丙酸酯的Ireland-Claisen重排获得。后者是在立体选择性Paterson aldol反应中获得的高选择性Evans-Tishchenko还原羟基酮的直接结果。杜立舒利(1)最终分别以总共17或15(14)个线性步骤获得,代表了对该高生物活性天然产物先前合成方法的实质性改进。