Catalyst‐Free Decarboxylation of Carboxylic Acids and Deoxygenation of Alcohols by Electro‐Induced Radical Formation
作者:Xiaoping Chen、Xiaosheng Luo、Xiao Peng、Jiaojiao Guo、Jiantao Zai、Ping Wang
DOI:10.1002/chem.201905224
日期:2020.3.12
derived from naturally abundant carboxylic acids and alcohols provides a sustainable and inexpensive approach to radical formation via undivided electrochemical cells. The resulting radicals are trapped by an electron-poor olefin or hydrogen atom source to furnish the Giese reaction or reductive decarboxylation products, respectively. A broad range of carboxylic acid (1°, 2°, and 3°) and alcohol (2° and
Organocopper(I) reagents, RCu, are both more stable and more reactive when prepared in dimethyl sulfide instead of ether or tetrahydrofuran. A wide range of Li reagents has been investigated with good results, as has a selection of Grignard reagents. Excellent yields of products are observed with typical substrates such as α,β-unsaturated ketones and acid chlorides.
Acridine Photocatalysis: Insights into the Mechanism and Development of a Dual-Catalytic Direct Decarboxylative Conjugate Addition
作者:Hang T. Dang、Graham C. Haug、Vu T. Nguyen、Ngan T. H. Vuong、Viet D. Nguyen、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/acscatal.0c03440
日期:2020.10.2
Conjugateaddition is one of the most synthetically useful carbon–carbon bond-forming reactions; however, reactive carbon nucleophiles are typically required to effect the addition. Radical conjugateaddition provides an avenue for replacing reactive nucleophiles with convenient radical precursors. Carboxylicacids can serve as simple and stable radical precursors by way of decarboxylation, but activation
the utilization of light energy for the activation of organic substrates. Here, we demonstrate the catalytic application of ligand-to-metal charge-transfer (LMCT) excitation of cerium alkoxide complexes for the facile activation of alkanes utilizing abundant and inexpensive cerium trichloride as the catalyst. As demonstrated by cerium-catalyzed C-H amination and alkylation of hydrocarbons, this reaction
Synthesis of lactate derivatives via reductive radical addition to α-oxyacrylates
作者:Justin B. Diccianni、Mason Chin、Tianning Diao
DOI:10.1016/j.tet.2019.05.002
日期:2019.8
Lactate derivatives are important synthetic precursors to a variety of pharmaceutical products. Previously reported methods to prepare lactates require multiple steps or have limited scopes. Herein, we report a Ni-catalyzed reductive addition of a variety of alkyl iodides to α-oxyacrylates to afford substituted lactates. Exploring the scope of radical acceptors reveals that electron-deficient alkenes