Sequence‐Dependent Stereodivergent Allylic Alkylation/Fluorination of Acyclic Ketones
作者:Xi‐Jia Liu、Shicheng Jin、Wen‐Yun Zhang、Qiang‐Qiang Liu、Chao Zheng、Shu‐Li You
DOI:10.1002/anie.201912882
日期:2020.1.27
The stereodivergent iridium-catalyzed allylicalkylation and fluorination of acyclicketones is described. α-Pyridyl-α-fluoroketones with vicinal tertiary and quaternary stereocenters were obtained in moderate to excellent yields and stereoselectivities. Distinct from known stereodivergent synthesis, for which two different chiral catalysts are required in general, herein we report a sequence-dependent
Iridium-catalyzed regio- and enantioselective allylic alkylation of fluorobis(phenylsulfonyl)methane
作者:Wen-Bo Liu、Sheng-Cai Zheng、Hu He、Xiao-Ming Zhao、Li-Xin Dai、Shu-Li You
DOI:10.1039/b914315g
日期:——
Highly regio- and enantioselectiveallylic alkylation of fluorobis(phenylsulfonyl)methane (FBSM) has been realized by [Ir(COD)Cl](2)/phosphoramidite, affording enantiopure fluorobis(phenylsulfonyl)methylated compounds bearing a terminal alkene, which could be converted to monofluoro-methylated ibuprofen in just two steps without loss of the optical purity (95% ee).
作者:Can-Can Bao、Dong-Song Zheng、Xiao Zhang、Shu-Li You
DOI:10.1021/acs.organomet.8b00762
日期:2018.12.24
N-Heterocyclic carbenes (NHCs) were found to be suitable ligands in Ir-catalyzed intermolecular allylic alkylation reaction. In the presence of a catalyst derived from [Ir(dncot)Cl]2 (dncot = dinaphthocyclooctatetraene) and triazolium salt L7, the alkylation products from the reaction of aryl allyl carbonates with sodium dialkyl malonates could be obtained in 85–99% yields favoring the formation of
发现N-杂环卡宾(NHC)是Ir催化的分子间烯丙基烷基化反应中的合适配体。在[Ir(dncot)Cl] 2(dncot =二萘环辛酸酯四烯)和三唑鎓盐L7衍生的催化剂存在下,芳基烯丙基碳酸酯与二烷基丙二酸钠的反应可得到烷基化产物,收率高达85-99%,形成支链产物(90/10→> 99/1 b / l)。此外,手性二氢异喹啉型NHC(DHIQ-NHC)(L8)已成功应用于Ir催化的不对称烯丙基烷基化反应中。对于广泛的底物,获得了优异的对映选择性和中等的区域选择性。
Enantioselective synthesis of 10-allylanthrones via iridium-catalyzed allylic substitution reaction
作者:Zheng-Le Zhao、Qing Gu、Xin-Yan Wu、Shu-Li You
DOI:10.1016/j.cclet.2016.02.017
日期:2016.5
Abstract A highly enantioselective allylicsubstitution reaction of anthrones with aromatic or aliphatic allyl carbonates was realized by using iridium catalyst prepared from [Ir(COD)Cl]2 and BHPphos. Substituted 10-allylanthrones were obtained in excellent yields and with excellent enantioselectivity and regioselectivity (up to 98% yield, 99% ee) under mild conditions.
Ir-Catalyzed Intermolecular Asymmetric Allylic Alkylation of β-Tetralones
作者:Dong-Song Zheng、Zheng-Le Zhao、Qing Gu、Shu-Li You
DOI:10.1021/acs.organomet.9b00416
日期:2019.10.28
asymmetric alkylation of substituted β-tetralones has been realized. In the presence of an Ir complex, derived from 2 mol % of [Ir(cod)Cl]2 and 4 mol % of the Alexakis ligand, asymmetric allylic alkylation reactions of various β-tetralones and allyl carbonates proceeded smoothly in good to excellent yields with excellent enantioselectivity. The reaction provides an efficient synthesis of highly enantioenriched