Single-Operation Deracemization of 3H-Indolines and Tetrahydroquinolines Enabled by Phase Separation
摘要:
The single-operation deracemization of 3H indolines and tetrahydroquinolines is described. An asymmetric redox approach was employed, in which a phosphoric acid catalyst, oxidant, and reductant are present in the reaction mixture. The simultaneous presence of both oxidant and reductant was enabled by phase separation and resulted in the isolation of highly enantioenriched starting materials in high yields.
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
Highly Enantioselective Synthesis of Indolines: Asymmetric Hydrogenation at Ambient Temperature and Pressure with Cationic Ruthenium Diamine Catalysts
作者:Zhusheng Yang、Fei Chen、Yanmei He、Nianfa Yang、Qing-Hua Fan
DOI:10.1002/anie.201607890
日期:2016.10.24
asymmetric hydrogenation of 1H‐indoles and 3H‐indoles at ambient temperature and pressure, catalyzed by chiral phosphine‐free cationic ruthenium complexes, has been developed. Excellent enantio‐ and diastereoselectivities (up to >99 % ee, >20:1 d.r.) were obtained for a wide range of indolederivatives, including unprotected 2‐substituted and 2,3‐disubstituted 1H‐indoles, as well as 2‐alkyl‐ and 2‐aryl‐substituted
chiral diiron complexes exhibit efficient catalytic reactivity in dehydrogenative kineticresolution of indolines using environmentally benign hydrogen peroxide as oxidant. In particular, complex C9 bearing sterically encumbered salan ligands and a 2-naphthoate bridge is identified as the optimal catalyst in terms of chiral recognition. Further investigation reveals that this MMO mimic chiral catalyst
Manganese‐Catalyzed Asymmetric Hydrogenation of
<i>3H</i>
‐Indoles
作者:Chenguang Liu、Mingyang Wang、Yihan Xu、Yibiao Li、Qiang Liu
DOI:10.1002/anie.202202814
日期:2022.5.9
General and efficient asymmetric hydrogenation (AH) of 3H-indoles has been realized using a well-defined chiral pincer manganese catalyst, with up to 99 % ee and a record TON of 72 350 in an earth-abundant metal-catalyzed AH reaction.
使用定义明确的手性钳形锰催化剂实现了3H-吲哚的通用且有效的不对称氢化 (AH),在地球资源丰富的金属催化 AH 反应中,ee 高达 99%,创纪录的 TON 为 72 350。
Asymmetric Synthesis of Optically Active Spirocyclic Indoline Scaffolds through an Enantioselective Reduction of Indoles
作者:Ruediger Borrmann、Nils Knop、Magnus Rueping
DOI:10.1002/chem.201605450
日期:2017.1.18
An enantioselective synthesis of spirocyclic indoline scaffolds was achieved by applying an asymmetric iridium‐catalyzed hydrogenation of 3H‐indoles. Low catalyst loadings and mild reaction conditions provide a broad range of differently substituted products with excellent yields and enantioselectivities. The developed methodology allows an efficient synthesis of this important spirocyclic structural