A chiral Lewisbaseorganocatalyzedenantioselectivehydrosilylation of 1,4-benzoxazines is presented. The reactions afforded various enantioenriched 3-substituted dihydro-2 H -1,4-benzoxazines with high yields (up to 98%) in moderate enantioselectivities (up to 87% ee).
提出了一种手性路易斯碱有机催化的 1,4-苯并恶嗪的对映选择性氢化硅烷化。该反应以中等对映选择性(高达 87% ee)的高产率(高达 98%)提供了各种对映体富集的 3-取代二氢-2 H -1,4-苯并恶嗪。
Chiral phosphoric acid catalyzed oxidative kinetic resolution of cyclic secondary amine derivatives including tetrahydroquinolines by hydrogen transfer to imines
The title reaction of tetrahydroquinolines with ketimine in the presence of chiral phosphoric acid proceeded with efficient conversion and excellent enantioselectivities.
Asymmetric Pnictogen-Bonding Catalysis: Transfer Hydrogenation by a Chiral Antimony(V) Cation/Anion Pair
作者:Jian Zhang、Jun Wei、Wei-Yi Ding、Shaoyu Li、Shao-Hua Xiang、Bin Tan
DOI:10.1021/jacs.1c02808
日期:2021.5.5
Pnictogen-bonding catalysisbased on σ-hole interactions has recently attracted the attention of synthetic chemists. As a proof-of-concept for asymmetric pnictogen-bonding catalysis, we report herein an enantioselective transfer hydrogenation of benzoxazines catalyzed by a novel chiral antimony cation/anion pair. The chiral pnictogen catalyst library could be rapidly accessed from triarylstibine with
Biomimetic Hydrogenation Catalyzed by a Manganese Model of [Fe]‐Hydrogenase
作者:Hui‐Jie Pan、Xile Hu
DOI:10.1002/anie.201914377
日期:2020.3.16
[Fe]-hydrogenase is an efficient biological hydrogenation catalyst. Despite intense research, Fe complexes mimicking the active site of [Fe]-hydrogenase have not achieved turnovers in hydrogenation reactions. Herein, we describe the design and development of a manganese(I) mimic of [Fe]-hydrogenase. This complex exhibits the highest activity and broadest scope in catalytic hydrogenation among known
A metal-free hydrogenation of 3-substituted 2H-1,4-benzoxazines
作者:Simin Wei、Xiangqing Feng、Haifeng Du
DOI:10.1039/c6ob01556e
日期:——
A metal-free hydrogenation of 3-substituted 2H-1,4-benzoxazines has been successfully realized with 2.5 mol% of B(C6F5)3 as a catalyst to furnish a variety of 3,4-dihydro-2H-1,4-benzoxazines in 93–99% yields. Up to 42% ee was also achieved for the asymmetric hydrogenation with the use of a chiral diene and HB(C6F5)2.
以2.5摩尔%的B(C 6 F 5)3为催化剂,成功地实现了3取代2 H -1,4-苯并恶嗪的无金属氢化,以提供各种3,4-二氢-2 H -1,4-苯并恶嗪的产率为93-99%。通过使用手性二烯和HB(C 6 F 5)2进行不对称氢化反应,还可以达到高达42%ee 。