Amine‐Free, Directing‐Group‐Free and Redox‐Neutral α‐Alkylation of Saturated Cyclic Ketones

Author:

Qiao Jia12,Ci Rui‐Nan12,Gan Qi‐Chao12,Huang Cheng12,Liu Zan12,Hu Hui‐Lan12,Ye Chen12,Chen Bin12,Tung Chen‐Ho12,Wu Li‐Zhu12ORCID

Affiliation:

1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials New Cornerstone Science Laboratory Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China

2. School of Future Technology University of Chinese Academy of Sciences Beijing 100049 China

Abstract

AbstractThe activation of the α‐C−H bond of ketones typically requires an amine and a directing group to guide the reaction selectivity in amine‐catalysis carbonyl chemistry. For an α‐C−H bond activation of ketone, directing groups are also required to control the reaction selectivity. Reported herein is the first α‐alkylation of cyclic ketones in the absence of an amine catalyst and directing group. 1H NMR, XPS, EPR studies and DFT calculations indicate that an α‐carbon radical intermediate is formed through direct and selective activation of the inert α‐C−H bond of ketones chelating on the surface of colloidal quantum dots (QDs). Such an interaction is essential for weakening the C−H bond, as exemplified, using CdSe QDs as the sole photocatalyst to execute α‐C−H alkylation of cyclic ketones under visible‐light irradiation. Without an amine catalyst and directing group, the high step‐ and atom‐economy transformation under redox‐neutral condition opens a new way for α‐C−H functionalization of ketones in carbonyl chemistry.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Medicine

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