不对称氢化是制备单一对映体化合物的最有效方法之一。然而,在具有多个不饱和键的底物中相对惰性的不饱和基团的化学和对映选择性氢化仍然是一个挑战。我们在此报告了共轭烯炔的高度化学和对映选择性氢化同时保持炔键完整的协议。机理研究表明,Co II 配合物的锌还原产生的伴随的 Zn 2+在启动合理的 Co I /Co III催化循环中起着关键作用。这种方法可以高效生成手性炔丙胺(高达 99.9 % ee 和 2000 S/C)和进一步有用的化学转化。
An Enzymatic Platform for Primary Amination of 1-Aryl-2-alkyl Alkynes
作者:Zhen Liu、Zi-Yang Qin、Ledong Zhu、Soumitra V. Athavale、Arkajyoti Sengupta、Zhi-Jun Jia、Marc Garcia-Borràs、K. N. Houk、Frances H. Arnold
DOI:10.1021/jacs.1c11340
日期:2022.1.12
challenging. Here, we report an enzymatic platform for the enantioselective propargylic amination of alkynes using a hydroxylamine derivative as the nitrene precursor. Cytochrome P450 variant PA-G8 catalyzing this transformation was identified after eight rounds of directed evolution. A variety of 1-aryl-2-alkyl alkynes are accepted by PA-G8, including those bearing heteroaromatic rings. This biocatalytic
Biocatalytic Asymmetric Synthesis of Optically Pure Aromatic Propargylic Amines Employing ω-Transaminases
作者:Nina G. Schmidt、Robert C. Simon、Wolfgang Kroutil
DOI:10.1002/adsc.201500086
日期:2015.5.26
The asymmetric reductive bio‐amination of prochiral aromatic propargyl ketones led to the corresponding amines in optically pure form (ee>99%). The (R)‐ as well as the (S)‐enantiomers of the propargylic amines were obtained, employing either (R)‐selective ω‐transaminases (ω‐TAs) originating from Arthrobacter sp. and Aspergillus terreus or an (S)‐selective ω‐TA from Chromobacterium violaceum. The product
blocks in organic synthesis. We demonstrate a straightforward enzymatic cascade to synthesize enantiomerically pure propargylic alcohols and amines from readily available racemic starting materials. In the first step, the peroxygenase from Agrocybe aegerita converted the racemic propargylic alcohols into the corresponding ketones, which then were converted into the enantiomerically pure alcohols using
炔丙醇和胺是有机合成中的通用组成部分。我们展示了一种简单的酶级联反应,可以从容易获得的外消旋起始材料合成对映异构纯的炔丙醇和胺。在第一步中,来自Agrocybe aegerita的过氧化酶将外消旋炔丙醇转化为相应的酮,然后使用来自开菲尔乳杆菌的 ( R )-选择性醇脱氢酶或 ( S )-选择性醇脱氢酶将其转化为对映体纯醇来自布罗基热厌氧菌. 此外,使用来自土曲霉的( R )-选择性胺转氨酶或来自紫色色杆菌的( S )-选择性胺转氨酶,建立了将外消旋醇酶促Mitsunobu型转化为对映体富集的炔丙基胺。一锅两步级联反应以 70-99% 的产率产生了范围广泛的对映体富集的醇和胺产物。
Synthesis of Enantiomerically Pure α-Substituted Propargylic Amines by Reaction of Organoaluminum Reagents with Oxazolidines
作者:J. Blanchet、M. Bonin、L. Micouin、H.-P. Husson
DOI:10.1021/jo0003706
日期:2000.10.1
Various oxazolidines prepared in two steps from (R)-phenylglycinol react at 0 degrees C with dialkyl-alkynylalane-triethylamine complexes in the presence of trimethylaluminum in high yield and diastereoselectivity. Enantiomerically pure primary alpha-substituted propargylamines cah be easily obtained in two steps after removal of ferrocenylmethyl protective group under smooth acidic conditions and oxidative cleavage of the chiral appendage.
Merging Nucleophilic and Hydrogen Bonding Catalysis: An Anion Binding Approach to the Kinetic Resolution of Propargylic Amines
作者:Eric G. Klauber、Chandra Kanta De、Tejas K. Shah、Daniel Seidel
DOI:10.1021/ja105337h
日期:2010.10.6
An efficient kinetic resolution of primary propargylic amines with s-factors of up to 56 is reported. The strategy is based on a dual catalytic approach, namely the use of a newly developed and easy-to-make thiourea-amide anion binding catalyst in combination with 4-(dimethylamino)pyridine (DMAP), both employed at a 5 mol% catalyst loading. Benzylic amines are also resolved with s-factors of up to 38.