Kharasch reaction: Cu-catalyzed and non-Kharasch metal-free peroxidation of barbituric acids
作者:Oleg V. Bityukov、Vera A. Vil'、George K. Sazonov、Andrey S. Kirillov、Nikita V. Lukashin、Gennady I. Nikishin、Alexander O. Terent'ev
DOI:10.1016/j.tetlet.2019.02.042
日期:2019.3
It was discovered that the Kharasch peroxidation of barbituricacids proceeds both with a Cu-catalyst and without a metal catalyst. Despite the presence of possible thermal-initiated side oxidation pathways, α-tert-butylperoxybarbiturates were selectively prepared from substituted barbituricacids and tert-butyl hydroperoxide.
作者:Oleg V. Bityukov、Andrey S. Kirillov、Pavel Yu. Serdyuchenko、Maria A. Kuznetsova、Valentina N. Demidova、Vera A. Vil’、Alexander O. Terent'ev
DOI:10.1039/d2ob00343k
日期:——
The electrochemical thiocyanation of barbituricacids with NH4SCN was disclosed in an undivided cell under constant current conditions. The electrosynthesis is the most efficient at a record high current density (janode ≈50–70 mA cm−2). NH4SCN has a dual role as the source of the SCN group and as the electrolyte. Electrochemical thiocyanation of barbituricacids starts with the generation of (SCN)2
巴比妥酸与 NH 4 SCN 的电化学硫氰化反应在恒流条件下的未分隔电池中进行了公开。在创纪录的高电流密度( j阳极≈50–70 mA cm -2)下,电合成效率最高。NH 4 SCN 作为SCN基团的来源和作为电解质具有双重作用。巴比妥酸的电化学硫氰化反应始于 (SCN) 2的生成来自硫氰酸根阴离子。将硫氰加成到巴比妥酸的烯醇互变异构体的双键上,得到硫氰化巴比妥酸。各种具有不同官能团的硫氰化巴比妥酸以 18-95% 的收率获得,并显示出有希望的抗真菌活性。
Electrochemical Generation of Peroxy Radicals and Subsequent Peroxidation of 1,3-Dicarbonyls in an Undivided Cell
作者:Oleg V. Bityukov、Ksenia V. Skokova、Vera A. Vil’、Gennady I. Nikishin、Alexander O. Terent’ev
DOI:10.1021/acs.orglett.3c03780
日期:2024.1.12
The generation of peroxy radicals from hydroperoxides with subsequent selective peroxidation of 1,3-dicarbonyls in an undivided electrochemical cell under constant current conditions is reported. The method provides a variety of peroxy-containing barbituric acids and 4-hydroxy-2(5H)-furanones with yields of up to 74%. Only the combination of anodic and cathodic processes provides efficient peroxidation
Intramolecular Pd-Catalyzed Reductive Amination of Enolizable sp<sup>3</sup>-C–H Bonds
作者:Russell L. Ford、Isabel Alt、Navendu Jana、Tom G. Driver
DOI:10.1021/acs.orglett.9b03458
日期:2019.11.1
A palladium-catalyzed reductive cyclization of nitroarenes has been designed to construct sp3-C–NHAr bonds from sp3-C–H bonds by using an enolizable nucleophile to intercept a nitrosoarene intermediate. Exposure of ortho-substituted nitroarenes to 5 mol % of Pd(OAc)2 and 10 mol % of phenanthroline under 2 atm of CO constructs partially saturated 5-, 6-, or 7-membered N-heterocycles using α-pyridyl