用 CO 2对炔烃进行双官能团羧化是一种可持续且重要的策略,可以从两种现成的起始材料中生成有价值的丙烯酸酯衍生物。然而,此类协议总是会使用过量的金属试剂和过渡金属残留物。在此,我们报道了炔烃与苯硫酚和 CO 2的第一次硫代羧化反应,这是一个可见光驱动且无过渡金属的过程。与之前通过CO 2的双电子活化对炔烃进行羧化反应相比,机理和计算研究表明 CO 2的单电子活化参与硫代羧化,呈现独特的β-羧化。随后的环化酰化有效地提供了重要的硫色酮。此外,一锅法具有温和的反应条件(室温,1 个大气压的 CO 2)、高化学和区域选择性、易于扩展和易于将产物衍生为生物活性化合物。
A new class of antimalarial drugs: derivatives of benzothiopyrans
作者:Raj K. Razdan、Robert J. Bruni、Avinash C. Mehta、Klaus K. Weinhardt、Zinon B. Papanastassiou
DOI:10.1021/jm00205a010
日期:1978.7
A series of substituted benzothiopyrans was synthesized and examined for antimalarial activity. Some were found to be active and curative at dose levels of 160--360 mg/kg against Plasmodium berghei in mice. Afew observations concerning structure-activity relationships were made. The benzothiopyrans were prepared by treatment of either the gem-dichloro- or the thionothioflavone intermediate with various primary amines. The thionothioflavone intermediates were made from thioflavones. Condensation of thiophenols with benzoyl acetates gave the thioflavones.