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
Decarboxylative Alkyl Coupling Promoted by NADH and Blue Light
作者:Rajdip Chowdhury、Zhunzhun Yu、My Linh Tong、Stefanie V. Kohlhepp、Xiang Yin、Abraham Mendoza
DOI:10.1021/jacs.0c09678
日期:2020.11.25
Photoexcited dihydronicotinamides like NADH and analogues have been found to generate alkyl radicals upon reductive decarboxylation of redox-active esters without auxiliary photocatalysts. This principle allowed aliphatic photocoupling between redox-active carboxylate derivatives and electron-poor olefins, displaying surprising water and air-tolerance and unusually high coupling rates in dilute conditions
已经发现光激发的二氢烟酰胺(如 NADH 和类似物)在没有辅助光催化剂的情况下,在氧化还原活性酯的还原脱羧时产生烷基自由基。这一原理允许氧化还原活性羧酸盐衍生物和缺电子烯烃之间的脂肪族光耦合,显示出令人惊讶的防水和空气耐受性以及在稀释条件下异常高的耦合率。展示了在其他羧酸存在下反应的正交性及其在 DNA 功能化中的效用,特别是将可见光与 NADH(生命普遍存在的还原剂)结合使用。
Oxalates as Activating Groups for Alcohols in Visible Light Photoredox Catalysis: Formation of Quaternary Centers by Redox-Neutral Fragment Coupling
作者:Christopher C. Nawrat、Christopher R. Jamison、Yuriy Slutskyy、David W. C. MacMillan、Larry E. Overman
DOI:10.1021/jacs.5b07678
日期:2015.9.9
Alkyl oxalates are new bench-stable alcohol-activating groups for radical generation under visiblelightphotoredox conditions. Using these precursors, the first net redox-neutralcoupling of tertiary and secondary alcohols with electron-deficient alkenes is achieved.
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
Reductive addition to electron-deficient olefins with trivalent iodine compounds
作者:Hideo Togo、Masahiko Aoki、Masataka Yokoyama
DOI:10.1016/s0040-4020(01)88042-x
日期:1993.9
(Diacyloxyiodo)arene was treated with electron-deficientolefins in the presence of hydrogen donor such as 1,4-cyclohexadiene to give the reductive addition products via alkyl radical through the radical decarboxylative pathway in good yields. Moreover, this system was able to generate either alkoxycarbonyl radicals or alkyl radicals with [bis(alkoxyoxalyloxy)iodo]benzene, which was prepared from alcohol