Total Synthesis of (<i>S</i>)-(−)-(<i>E</i>)-15,16-Dihydrominquartynoic Acid: A Highly Potent Anticancer Agent
作者:Benjamin W. Gung、Godwin Kumi
DOI:10.1021/jo049920g
日期:2004.5.1
The conjugated entriyne natural product, (S)-(E)-15,16-dihydrominquartynoic acid (1), is synthesized in five linear steps and 30% overall yield from the known aldehyde 11. The key step is a one-pot in situ desilylation/Cadiot−Chodkiewicz coupling reaction affording the entriyne unit. The bromoalkyne 6 with an ω-carboxylic acid group was found to undergo a copper-catalyzed cross-coupling reaction producing
共轭Entriyne天然产物(S)-(E)-15,16-dihydrominquartynoicicic acid(1)由五个线性步骤合成,总产率为30%,由已知的醛11制成。关键步骤是一锅式原位甲硅烷基化反应/ Cadiot-Chodkiewicz偶联反应,提供了恩炔炔单元。发现具有ω-羧酸基团的溴炔烃6经历铜催化的交叉偶联反应,产生所需的二炔中间体10,而相应的ω-酯溴炔烃14在多种条件下均不能与三乙基甲硅烷基乙炔偶合。