Chiral spiroaminoborate ester as a highly enantioselective and efficient catalyst for the borane reduction of furyl, thiophene, chroman, and thiochroman-containing ketones
摘要:
Prochiral heteroaryl ketones containing furan, thiophene, chroman, and thiochroman moieties were successfully reduced in the presence of 1-10 mol% of spiroaminoborate ester 1 with different borane sources to afford non-racemic alcohols in up to 99% ee. In addition, modest enantioselectivity, around 80% ee, was achieved in the reduction of linear alpha,beta-unsaturated heteroaryl ketones. (C) 2009 Elsevier Ltd. All rights reserved.
Novel dimethoxy(aminoalkoxy)borate derived from (S)-diphenylprolinol as highly efficient catalyst for the enantioselective boron-mediated reduction of prochiral ketones
作者:Viatcheslav Stepanenko、Margarita Ortiz-Marciales、Charles L. Barnes、Carmelo Garcia
DOI:10.1016/j.tetlet.2008.12.061
日期:2009.3
The novel dimethoxyl(aminoalkoxy)borate 1 was isolated as a white crystalline dimer joined by H-bonding as evidenced by X-ray analysis, and demonstrated to be a highly effective catalyst for the asymmetric reduction of representative prochiral ketones with borane–DMS. Optically pure alcohols were obtained using only 1 mol % of catalyst 1 in up to 99% ee.
X 射线分析证明,新型二甲氧基(氨基烷氧基)硼酸酯1为白色结晶二聚体,通过氢键连接,并被证明是硼烷-DMS 不对称还原代表性前手性酮的高效催化剂。仅使用 1 mol% 的催化剂1,在高达 99% ee 的情况下即可获得光学纯醇。
(η<sup>6</sup>-Arene)Ru<sup>II</sup>/Chiral
SN Ligand: A Novel Bifunctional Catalyst System for Asymmetric Transfer
Hydrogenation of Aromatic Ketones
A binary catalyst system of [RuCl2(η6-arene)]2 and a protic aminothiol (SN) ligand has been found to promote hydrogen transfer between alcohols and carbonyl compounds. The chiral catalyst system with the pipecolinol-derived chiral SN ligand displays excellent stereoselectivity in the asymmetric transfer hydrogenation of aromatic ketones using HCO2H-Et3N. Novel unsymmetrical bis(thiolate)-bridged binuclear complex, which is relevant to the generation of catalytically active species, has been synthesized and structurally characterized.
发现了一种二元催化剂体系,由 [RuCl2(η6-芳烃)]2 和质子性氨基硫醇 (SN) 配体组成,能够促进醇和羰基化合物之间的氢转移。使用 HCO2H-Et3N 的具有哌啶醇衍生的手性 SN 配体的二元催化剂体系在对芳香酮的不对称转移氢化中显示出优异的立体选择性。合成并结构表征了一种新型非对称双硫醇盐桥连的双核配合物,该配合物与催化活性物种的生成相关。
Synthesis of Spiroborate Esters from 1,2-Aminoalcohols, Ethylene Glycol and Triisopropyl Borate: Preparation of (<i>S</i>)-1-(1,3,2-Dioxaborolan-2-yloxy)-3-Methyl-1,1-Diphenylbutan-2-Amine
Mechanochemical, Water‐Assisted Asymmetric Transfer Hydrogenation of Ketones Using Ruthenium Catalyst
作者:Vanessza Judit Kolcsár、György Szőllősi
DOI:10.1002/cctc.202101501
日期:2022.2.8
The first highly efficient, aqueous phase mechanochemical asymmetrictransferhydrogenation of prochiral ketones is reported using in situ formed Noyori-Ikariya Ru-complex and sodium formate as hydrogen donor in ball mill.
Chiral spiroaminoborate ester as a highly enantioselective and efficient catalyst for the borane reduction of furyl, thiophene, chroman, and thiochroman-containing ketones
作者:Viatcheslav Stepanenko、Melvin De Jesús、Wildeliz Correa、Lorianne Bermúdez、Cindybeth Vázquez、Irisbel Guzmán、Margarita Ortiz-Marciales
DOI:10.1016/j.tetasy.2009.11.009
日期:2009.12
Prochiral heteroaryl ketones containing furan, thiophene, chroman, and thiochroman moieties were successfully reduced in the presence of 1-10 mol% of spiroaminoborate ester 1 with different borane sources to afford non-racemic alcohols in up to 99% ee. In addition, modest enantioselectivity, around 80% ee, was achieved in the reduction of linear alpha,beta-unsaturated heteroaryl ketones. (C) 2009 Elsevier Ltd. All rights reserved.