Asymmetric induction in the inter- and intramolecular radical carbon–carbon bond forming reactions of N-arylsulfonyl-α-bromocarboxamides with chiral ligands: the use of chiral sulfoxide ligands in radical chemistry
作者:Kunio Hiroi、Mikiyo Ishii
DOI:10.1016/s0040-4039(00)01213-2
日期:2000.9
Inter- and intramolecular asymmetric radical carbon–carbon bond-forming reactions of sulfonamides were successfully achieved using chiral ligands in the presence of Lewis acids. The use of chiral sulfoxides as chiral ligands in the radical reactions of sulfonamides provided higher enantioselectivity, proceeding through a diastereomerically more favorable intermediate, presumably by enantiotopically
在路易斯酸存在下,使用手性配体成功实现了磺酰胺类分子间和分子内不对称自由基碳-碳键形成反应。在磺酰胺的自由基反应中使用手性亚砜作为手性配体提供了更高的对映选择性,这是通过非对映异构的更有利的中间体进行的,大概是通过磺酰胺的两个氧原子之一的对位选择性配位进行的。