Regenerable Dihydrophenanthridine via Borane-Catalyzed Hydrogenation for the Asymmetric Transfer Hydrogenation of Benzoxazinones
作者:Bochao Gao、Wei Meng、Xiangqing Feng、Haifeng Du
DOI:10.1021/acs.orglett.2c01314
日期:2022.6.10
The highly enantioselective transfer hydrogenation of benzoxazinones with chiral phosphoric acids under H2 was successfully achieved, where boranes promoted the hydrogenation of phenanthridine for the regeneration of dihydrophenanthridine as the hydrogen donor. A variety of dihydrobenzoxazinones were obtained in high yields with up to 99% ee. The current work provides a promising solution to unreactive
成功实现了苯并恶嗪酮与手性磷酸在H 2下的高对映选择性转移加氢,其中硼烷促进菲啶的加氢以再生作为氢供体的二氢菲啶。以高达 99% ee 的高产率获得了多种二氢苯并恶嗪酮。目前的工作为受挫的路易斯对催化的不对称氢化提供了一种有前途的解决方案。
Manganese Pentacarbonyl Bromide as Regeneration Catalyst Enabled Biomimetic Asymmetric Reduction
Using readily available manganese pentacarbonyl bromide as a regeneration catalyst, biomimeticasymmetric reduction of imines including quinoxalinones, benzoxazinones, and benzoxazine has been successfully developed in the presence of transfer catalyst chiral phosphoric acids, providing the chiral amines with high yields and enantioselectivities.