开发了CuCl/( R , R )-Ph-BPE 催化的 2 H -色烯和 2 H -硫代色烯与烯丙磷酸亲电子试剂的对映选择性氢化烯丙基化反应,可高效、原子经济地不对称获得一系列 4-烯丙基色满和硫代色满的产率很高(高达 91%),具有优异的对映选择性(高达 99% ee)。这些有价值的手性苯并二氢吡喃和硫代苯并二氢吡喃产品可以作为获取含有氧和硫原子的生物活性化合物的关键中间体。此外,还研究了 RAW 264.7 巨噬细胞中各种色满和硫色满的抗氧化和抗炎作用。色满和硫色满对活性氧(ROS)的产生和促炎细胞因子的分泌表现出显着的抑制作用,包括白细胞介素-6(IL-6)和肿瘤坏死因子-α(TNF-α)。这些发现表明,新合成的色满和硫代色满有望成为抗氧化和抗炎药物开发的潜在先导化合物。
Formal Radical Cyclization onto Benzene Rings: A General Method and Its Use in the Synthesis of <i>e</i><i>nt</i>-Nocardione A
作者:Derrick L. J. Clive、Stephen P. Fletcher、Dazhan Liu
DOI:10.1021/jo030364k
日期:2004.5.1
An indirect method is described for effecting radical cyclization onto a benzene ring. Cross-conjugated dienones 6, which are readily prepared from phenols, undergo radical cyclization (6 → 7 → 8), and the products (8) are easily aromatized. The method has been applied to the synthesis of ent-nocardione A (21).
Aryl(sulfonyl)amino groups, readily derived from sulfonyl- or arylamines by standard methods as well as the recently introduced methods of sulfonylation and arylation, proved to be good leaving groups in intramolecular substitution reactions by various nitrogen, oxygen, and carbon nucleophiles.