Sequential Modifications of Metal–Organic Layer Nodes for Highly Efficient Photocatalyzed Hydrogen Atom Transfer
作者:Haifeng Zheng、Yingjie Fan、Abigail L. Blenko、Wenbin Lin
DOI:10.1021/jacs.3c02703
日期:2023.5.10
Zr-OTf-EY, through sequential modifications of metal cluster nodes in a metal–organic layer (MOL). With eosin Y and strong Lewisacids on the nodes, Zr-OTf-EY catalyzescross-couplingreactionsbetween various C–H compounds and electron-deficient alkenes or azodicarboxylate to afford C–C and C–N coupling products, with turnover numbers of up to 1980. In Zr-OTf-EY-catalyzed reactions, Lewisacid sites bind
A direct conversion of C(sp(3))-H bonds to C(sp3)-N bonds has been achieved by utilizing catalytic N-hydroxyphthalimide (NHPI) and stoichiometric dialkyl azodicarboxylate. NHPI functions as a precursor of the electron-deficient phthalimide N-oxyl radical (PINO) to abstract hydrogens, and dialkyl azodicarboxylate acts as a trapping agent of the resultant carbon radical to generate the hydrazine derivatives. This C-H amination proceeds in a highly chemoselective manner with a wide applicability to functionalize benzylic, propargylic, and aliphatic C-H bonds. Furthermore, the obtained hydrazine compounds were readily converted to the corresponding carbamates or amines. Hence, the present protocol for direct introduction of the nitrogen functionality serves as a powerful tool for efficient construction of nitrogen-substituted natural products and pharmaceuticals.
Selective Functionalization of Hydrocarbons Using a ppm Bioinspired Molecular Tweezer via Proton-Coupled Electron Transfer
作者:Hongyu Chen、Lingling Wang、Sheng Xu、Xiaohui Liu、Qian He、Lijuan Song、Hongbing Ji
DOI:10.1021/acscatal.1c01350
日期:2021.6.18
Anthraquinone-based covalent organic framework as a recyclable direct hydrogen atom transfer photocatalyst for C–H functionalization
作者:Zitong Wang、Pierce Yeary、Yingjie Fan、Wenbin Lin
DOI:10.1039/d4sc00241e
日期:——
Photocatalytic direct hydrogen atom transfer (d-HAT) is a synthetically important strategy to convert C–H bonds to useful C–X bonds. Herein we report the synthesis of an anthraquinone-based two-dimensional covalent organic framework, DAAQ-COF, as a recyclable d-HAT photocatalyst for C–H functionalization. Powder X-ray diffraction, N2 sorption isotherms, solid-state NMR spectra, infrared spectra, and