Quinone Reduction by Organo-Osmium Half-Sandwich Transfer Hydrogenation Catalysts
作者:Elizabeth M. Bolitho、Nathan G. Worby、James P. C. Coverdale、Juliusz A. Wolny、Volker Schünemann、Peter J. Sadler
DOI:10.1021/acs.organomet.1c00358
日期:2021.9.13
reduction of quinones, potential biological substrates, which play a major role in cellular electron transfer chains. We show that the series of [OsII(η6-arene)(R-PhDPEN)] derivatives exhibit high turnover frequencies, enantioselectivities (>92%), and conversions (>93%) for the asymmetrictransferhydrogenation (ATH) of acetophenone-derived substrates and reduce duroquinone and menadione to their di-alcohol
有机锇 (II) 16 电子配合物 [Os II (η 6 -芳烃)(R-PhDPEN)](其中 η 6 -芳烃 =对伞花烃或联苯)可以催化前手性酮还原为光学纯醇氢化物源的存在。这种复合物可以在癌细胞中实现丙酮酸向非天然d-乳酸的转化。为了提高这些锇配合物的催化性能,我们在对位(R 1 ) 或间位(R 2) 手性 R-苯基-磺酰基-二苯基乙二胺 (R-PhDPEN) 配体的位置,并探索了在细胞电子转移链中起主要作用的潜在生物底物醌的还原。我们表明 [Os II (η 6 -芳烃)(R-PhDPEN)] 系列衍生物在不对称转移氢化 (ATH) 中表现出高周转频率、对映选择性 (>92%) 和转化率 (>93%)。苯乙酮衍生的底物,并将杜罗醌和甲萘醌还原为它们的二元醇衍生物。使用密度泛函理论 (DFT) 计算的催化模型表明,涉及由催化剂胺基团辅助的甲酸去质子化、苯基-杜罗醌堆积、氢化物转移到 Os
Catalytic asymmetric Michael addition with curcumin derivative
作者:Wenjun Li、Wenbin Wu、Feng Yu、Huicai Huang、Xinmiao Liang、Jinxing Ye
DOI:10.1039/c0ob00757a
日期:——
Catalytic asymmetric Michael additions with curcumin derivatives were achieved by a new series of tertiary amine–thiourea organocatalysts to afford the Michael adducts in high yields and excellent enantioselectivities.
Enhanced Hydrogen Generation from Formic Acid by Half-Sandwich Iridium(III) Complexes with Metal/NH Bifunctionality: A Pronounced Switch from Transfer Hydrogenation
作者:Asuka Matsunami、Yoshihito Kayaki、Takao Ikariya
DOI:10.1002/chem.201502412
日期:2015.9.21
By switching the catalytic function fromtransferhydrogenation based on the metal/NH bifunctionality, facile dehydrogenation of formicacid was achieved by amido‐ and hydrido(amine)–Ir complexes derived from N‐triflyl‐1,2‐diphenylethylenediamine (TfDPEN) at ambient temperature even in the absence of base additives. Further acceleration was observed by the addition of water, leading to a maximum turnover
Ir(III) complexes of diamine ligands for asymmetric ketone hydrogenation
作者:José E.D. Martins、Martin Wills
DOI:10.1016/j.tet.2009.05.012
日期:2009.7
The use of a combination of IrCl3 with a series of ligands derived from the C2-symmetric diamine di-phenylethanediamine (DPEN) forms a catalyst capable of the asymmetric hydrogenation of ketones in up to 85% ee. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of Optically Active 1,2,3,4-Tetrahydroquinolines via Asymmetric Hydrogenation Using Iridium-Diamine Catalyst