Total Synthesis of Rutamycin B, a Macrolide Antibiotic from <i>Streptomyces </i><i>a</i><i>ureofaciens</i>
作者:James D. White、Roger Hanselmann、Randy W. Jackson、Warren J. Porter、Yoshihiro Ohba、Thomas Tiller、Shan Wang
DOI:10.1021/jo0104429
日期:2001.7.1
Rutamycin B (2) was synthesized from three principal subunits, spiroketal 75, keto aldehyde 83, and aldehyde 108. First, triol 62 was assembled by Julia coupling of sulfone 56 with aldehyde 58 followed by an acid-catalyzed spiroketalization. The three hydroxyl functions of 62 were successfully differentiated, leading to phosphonate 75. The latter was condensed in a Wadsworth-Emmons reaction with 83
Rutamycin B(2)由三个主要的亚基螺环酮75,酮醛83和醛108合成。首先,三元醇62通过砜56与醛58的茱莉亚偶联反应组装,然后进行酸催化的螺酮缩合。成功区分了62个化合物的三个羟基官能团,生成了膦酸酯75。后者在Wadsworth-Emmons反应中与从(R)-醛76分六步制得的83缩合,得到92。 92和108在严格取决于醛中对-甲氧基苄基醚的存在的过程中提供了具有高立体选择性的Felkin产物109。109通过醛116转化为乙烯基硼酸酯122,然后在Suzuki条件下进行大环化,得到123。对其进行彻底的脱甲硅烷基化得到芸霉素B。