Herein, we described photoenzymatic dynamic kinetic resolution (DKR) of amines under mild conditions. The racemization of amines via a photoredox-mediated hydrogen atom transfer (HAT) protocol in conjunction with an enzyme catalyst to achieve the DKR of amines allows a variety of primary amines to be converted into a single enantiomer in high yield and with excellent enantioselectivity. Notably, this
Chemoenzymatic Dynamic Kinetic Resolution of Secondary Alcohols and Amines Employing Copper-Based Photocatalysis
作者:Clémentine Minozzi、Nicolas Dowe、Noémie Beaucage、Shawn K. Collins
DOI:10.1021/acscatal.3c01713
日期:2023.7.7
A tandem photo- and biocatalytic dynamic kinetic resolution of secondary alcohols and amines was achieved employing a commercially available lipase, Candida antarctica lipase B (CALB), and a heteroleptic copper complex. The process is an example of using copper-based photocatalysis to promote hydrogen atom transfer (HAT) processes employing thiyl radicals. Screening of 48 complexes and 5 disulfides
使用市售脂肪酶、南极假丝酵母脂肪酶 B (CALB) 和杂配铜络合物,实现了仲醇和胺的串联光催化和生物催化动态动力学拆分。该过程是使用铜基光催化促进硫基自由基的氢原子转移(HAT)过程的一个例子。通过筛选 48 个配合物和 5 个二硫化物,确定 Cu(dtbbpy)(DPEPhos)BF 4和 (Ph 3 SiS) 2是促进 HAT 过程的最佳催化剂体系。该催化系统代表了适用于脂肪族和芳香族醇和胺的自由基介导的外消旋化的通用系统(18个例子,60→97%产率,76→99%ee)。
Chemoenzymatic Dynamic Kinetic Resolution of Primary Amines Catalyzed by CAL-B at 38–40 °C
作者:Florent Poulhès、Nicolas Vanthuyne、Michèle P. Bertrand、Stéphane Gastaldi、Gérard Gil
DOI:10.1021/jo201256w
日期:2011.9.2
The (R)-selective chemoenzymatic dynamic kinetic resolution of primary amines was performed at 38-40 degrees C in MTBE, in good to high yields and with high enantiomeric excesses. These reactions associating CAL-B to octanethiol as radical racemizing agent were carried out in the presence of methyl beta-methoxy propanoate as acyl donor, under photochemical irradiation at 350 nm in glassware.
Covalent Organic Frameworks Based Photoenzymatic Nano‐reactor for Asymmetric Dynamic Kinetic Resolution of Secondary Amines
作者:Lu Ran、Yu Chen、Yanqiu Zhu、Huanyu Cai、Huaji Pang、Dingce Yan、Yonggang Xiang、Huailong Teng
DOI:10.1002/anie.202319732
日期:2024.4.15
Candida antarctica lipase B (CALB) in a photosensitive covalent organic framework material COF-Ir. The bio-nanoreactor could serve as efficient catalyst in dynamic kinetic resolution of secondaryamines to give a series of chiral amines in high yields (up to 99 %) and enantioselectivities (up to 99 % ee). The heterogeneous photoenzymatic nanoreactor showed high stability and reusability.