The first total synthesis of neohelmanticins A–D, amino derivatives of the 1,2-dihydroxypropane core and biological evaluation
作者:Eppakayala Sreedhar、R. Sateesh Chandra Kumar、G. Venkateswar Reddy、A. Robinson、K. Suresh Babu、J. Madhusudana Rao、P.V. Srinivas
DOI:10.1016/j.tetasy.2009.02.022
日期:2009.3
accomplished in 15 steps starting from commercially available gallic acid. Swern oxidation conditions, a Grignard reaction, Sharpless kinetic resolution, and regioselective ring opening of an epoxide with lithium aluminum hydride (LAH) are the key features to install the basic core, dihydroxy phenyl propane 2. One hydroxyl group of this core was esterified with tiglic acid followed by the oxidation
从市售没食子酸开始,经过15个步骤即可完成新螺旋藻A-D的简明全合成。回转氧化条件,格氏反应,锐利的动力学拆分和氢化铝锂(LAH)形成的环氧化物的区域选择性开环是安装基本核心二羟基苯基丙烷2的关键特征。该核心的一个羟基被叔丁酸酯化,然后与相应的酸进行氧化和酯化反应,生成新螺旋体A–D。