作者:Jhillu Singh Yadav、Goreti Rajendar、Ramisetti Srinivasa Rao、Srihari Pabbaraja
DOI:10.1021/jo401248n
日期:2013.9.6
stereoselective approach for the synthesis of key intermediates for aplysiatoxins, oscillatoxins, and nhatrangins and their utility for the total synthesis of nhatrangin A has been demonstrated. The advanced intermediates aromatic aldehyde 11 and dihydroxy acid 12 were synthesized in eight steps (44% overall yield) and three steps (55% overall yield), respectively. An asymmetric Michael addition, CBS reduction
已经证明了一种用于合成海藻毒素,oscillatoxins和nhatrangins关键中间体的简洁立体选择方法,以及它们在nhatrangin A的全合成中的效用。分别以八个步骤(总产率为44%)和三个步骤(总产率为55%)合成了高级中间体芳族醛11和二羟基酸12。不对称的迈克尔加成反应,CBS还原反应和脯氨酸催化的交叉羟醛反应被用作生成主链羟醛的所有手性的关键步骤,而附加的侧链保护的3,4-二羟基戊酸则在最短的路线,使用Sharpless二羟基化,二醇保护和RuO 4-催化的芳族过氧化反应。在山口反应条件下,通过将二羟基酸12与β-羟基烯丙基酯(从11中获得)偶联,从而完成一环素A的合成,然后对所有保护基进行一锅脱保护。