Nonbifunctional Outer-Sphere Strategy Achieved Highly Active α-Alkylation of Ketones with Alcohols by <i>N</i>-Heterocyclic Carbene Manganese (NHC-Mn)
作者:Xiao-Bing Lan、Zongren Ye、Ming Huang、Jiahao Liu、Yan Liu、Zhuofeng Ke
DOI:10.1021/acs.orglett.9b03030
日期:2019.10.4
nonbifunctional outer-sphere strategy was successfully utilized in developing an easily accessible N-heterocyclic carbene manganese (NHC-Mn) system for highly active α-alkylation of ketones with alcohols. This system was efficient for a wide range of ketones and alcohols under mild reaction conditions, and also for the green synthesis of quinoline derivatives. The direct outer-sphere mechanism and the high activity
Ir-Catalyzed α-Alkylation of Ketones with Alcohols: One-Step Access to Donepezil
作者:Sen Wang、Rui Miao、Lu Ouyang、Yanping Xia、Yifei Wei、Renshi Luo
DOI:10.1055/a-1894-8826
日期:2022.12
We demonstrate an iridium-catalyzed alkylation of ketones with alcohols, which enables one-step access to donepezil, cyclic ketones, and linear ketones in high yields. A scale-up experiment shows the excellent practicability of this protocol. Comparative experiments show that a small amount of water is beneficial to the improvement of product yield.
Ligand-Controlled Ruthenium-Catalyzed Borrowing-Hydrogen and Interrupted-Borrowing-Hydrogen Methodologies: Functionalization of Ketones Using Methanol as a C1 Source
phosphine-free N,C–Ru and N,N–Ru catalysts for ligand-controlledborrowing-hydrogen (BH) and interrupted-borrowing-hydrogen (I-BH) methods, respectively. This protocol has been employed on a variety of ketonesusing MeOH as a green, sustainable, and alternative C1source to form a C–C bond through the BH and I-BH methods. Reasonably good substrate scope, functional group tolerance, and good-to-excellent yields
here a phosphine-free, quinoline-based pincer Mn catalyst for α-alkylation of methyl ketones using primary alcohols as alkyl surrogates. The C–C bond formation reaction proceeds via a hydrogen auto-transfer methodology. The sole by-product formed is water, rendering the protocol atom efficient. Electronic structure theory studies corroborated the proposed mechanism.