Reported herein is a visible‐light‐mediated radical approach to the α‐alkylation of ketones. This method exploits the ability of a nucleophilic organocatalyst to generate radicals upon SN2‐based activation of alkyl halides and blue light irradiation. The resulting open‐shell intermediates are then intercepted by weakly nucleophilic silyl enol ethers, which would be unable to directly attack the alkyl
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
Use of a Cyclometalated Iridium(III) Complex Containing a N<sup>∧</sup>C<sup>∧</sup>N-Coordinating Terdentate Ligand as a Catalyst for the α-Alkylation of Ketones and <i>N</i>-Alkylation of Amines with Alcohols
作者:Pengcheng Liu、Ran Liang、Lei Lu、Zhentao Yu、Feng Li
DOI:10.1021/acs.joc.6b02758
日期:2017.2.17
A cyclometalated iridium(III) complexcontaining a N∧C∧N-coordinating terdentate ligand [Ir(dpyx-N,C,N)Cl(μ-Cl)]2 was found to be a general and highly effective catalyst for the α-alkylation of ketones and N-alkylation of amines with alcohols. In the presence of catalyst (1 mol % Ir) and base (0.2–0.5 equiv), a variety of desirable products were obtained in good yields under an air atmosphere. Notably
Sustainable and Selective Alkylation of Deactivated Secondary Alcohols to Ketones by Non‐bifunctional Pincer N‐heterocyclic Carbene Manganese
作者:Xiao‐Bing Lan、Zongren Ye、Jiahao Liu、Ming Huang、Youxiang Shao、Xiang Cai、Yan Liu、Zhuofeng Ke
DOI:10.1002/cssc.202000576
日期:2020.5.22
A sustainable and green route to access diverse functionalized ketones via dehydrogenative-dehydrative cross-coupling of primary and secondary alcohols is demonstrated. This borrowing hydrogen approach employing a pincer N-heterocyclic carbene Mn complex displays high activity and selectivity. A variety of primary and secondary alcohols are well tolerant and result in satisfactory isolated yields.
Highly efficient arylations of β‐chloro ketones and their ester and amide derivatives were achieved by means of domino dehydrochlorination/Rh(I)‐catalyzed conjugate addition. In situ generated vinyl ketones and their analogues were identified as the reaction intermediates. The present synthetic protocol provides a concise route to (chiral) β‐aryl ketones, esters, and amides.