Asymmetric synthesis of (2R)- and (2S)-2-iodohexadecanal, natural inhibitors of the thyroid gland metabolism
作者:Claude Jacoby、Jean-Claude Braekman、Désiré Daloze
DOI:10.1016/0040-4020(96)00582-0
日期:1996.7
(2R)-(+)- and (2S)-(−)-2-iodohexadecanal 1 with ee's ≥ 89% were synthesized in five steps and 62% overall yield from chiral enol ethers , via the iodocyclization with IC1 and chromatographic separation of the resulting diastereomeric 1′-iododioxanes 8. The ee's of have been determined after their transformation to the (R)-O-methylmandelate esters 11 and 12 or to the epoxides , respectively. Their absolute
ee≥89 %的(2 R)-(+)-和(2 S)-(-)-2-碘六癸醛1通过手性烯醇醚的五步合成,通过IC1的碘环化和色谱法合成,ee≥89 %分离所得的非对映异构体1'-碘二恶烷8。在将ee分别转化为(R)-O-甲基扁桃酸酯11和12或环氧化物后,已经确定了ee 。它们的绝对构型已通过与13的化学相关性以及通过将Mosher方法应用于酯15来指定和16分别通过甲醇分解得到,然后衍生化。而且,已经显示出1的生物合成和抑制活性是非立体选择性的。