Total Synthesis of (+)-Geldanamycin and (−)-<i>o</i>-Quinogeldanamycin: Asymmetric Glycolate Aldol Reactions and Biological Evaluation
作者:Merritt B. Andrus、Erik L. Meredith、Erik J. Hicken、Bryon L. Simmons、Russell R. Glancey、Wei Ma
DOI:10.1021/jo034870l
日期:2003.10.1
The total synthesis of (+)-geldanamycin (GA), following a linear route, has been completed using a demethylative quinone-forming reaction as the last step. Key steps include the use of two new asymmetric boron glycolate aldol reactions. To set the anti-C11,12 hydroxymethoxy functionality, (S,S)-5,6-bis-4-methoxyphenyldioxanone 8 was used. Methylglycolate derived from norephedrine 5 set the C6,7 methoxyurethane
(+)-格尔德霉素(GA)的总合成遵循线性路线,最后一步是使用脱甲基醌形成反应完成的。关键步骤包括使用两个新的不对称乙醇酸硼酸羟醛缩醛反应。为了设定抗C11,12羟基甲氧基官能度,使用(S,S)-5,6-双-4-甲氧基苯基二恶烷酮8。衍生自去氧麻黄碱5的乙醇酸甲酯设置了C6,7甲氧基氨基甲酸酯的立体化学。与硝酸相比,使用硝酸的醌形成步骤得到的非天然邻-喹啉-GA产物55为10:1。其他已知的氧化剂产生了不寻常的氮杂醌产物49。o-Quino-GA 55以良好的亲和力结合Hsp90,但与GA相比,细胞毒性较小。