Alkenylation and allylation of alkyl iodides with alkenyl and allylsulfones, respectively, took place under Pd/photoirradiation system. The initial alkyl radical, derived from a single electron transfer between Pd(0) and RI, underwent the title transformations. Pd(0) was regenerated through a reductive elimination of PhSO2PdI, which is formed by the combination of the sulfonyl radical and the palladium
Visible-Light-Mediated Alkenylation, Allylation, and Cyanation of Potassium Alkyltrifluoroborates with Organic Photoredox Catalysts
作者:Drew R. Heitz、Komal Rizwan、Gary A. Molander
DOI:10.1021/acs.joc.6b01207
日期:2016.8.19
and ruthenium-free approaches to protectedallylicamines and alkyl nitriles under photoredox conditions are reported. An inexpensive organic dye, eosin Y, catalyzes coupling of Boc-protected potassium α-aminomethyltrifluoroborates with a variety of substituted alkenyl sulfones through an α-aminomethyl radical addition–elimination pathway. Allylic and homoallylic amines were formed in moderate yields
Alkylation of Allyl/Alkenyl Sulfones by Deoxygenation of Alkoxyl Radicals
作者:Jia-Bin Han、Ao Guo、Xiang-Ying Tang
DOI:10.1002/chem.201806138
日期:2019.2.26
challenging deoxygenation of alkoxyl radicals from readily accessible alcohol derivatives was developed, affording facile synthesis of functionalized alkenes with good functional group tolerance under mild reaction conditions. Because alkoxyl radicals can easily undergo β‐fragmentations or hydrogen abstractions, this new strategy for deoxygenation of alkoxyl radicals is highly valuable. Moreover, mechanistic
Mechanistic dichotomy in the solvent dependent access to <i>E vs. Z</i>-allylic amines <i>via</i> decarboxylative vinylation of amino acids
作者:Samir Manna、Shunta Kakumachi、Kanak Kanti Das、Youichi Tsuchiya、Chihaya Adachi、Santanu Panda
DOI:10.1039/d2sc02090d
日期:——
donor–acceptor based photocatalysts. The solvent-dependent access to E vs. Z-allylic amines was achieved via decarboxylative vinylation of amino acids with vinyl sulfones. Detailed experimental studies have been conducted to understand the role of the solvent in the reactivity and stereoselectivity of the vinylation reactions.
Iron-Catalyzed Electrophotochemical α-Functionalization of a Silylcyclobutanol
作者:Pan Zhou、Ling Ding、Yuxiu Liu、Hongjian Song、Qingmin Wang
DOI:10.1021/acs.orglett.4c02279
日期:2024.8.30
is important in organic chemistry, and selective cleavage and functionalization of these strained rings are of great interest. However, direct α-functionalization of cyclobutanols is rarely reported because of the high O–H bond dissociation energy and the occurrence of β-scission of C–C bonds in these alcohols. Recently, transition-metal catalysis has facilitated alkoxyradical generation. Herein, we