Unsaturated compounds containing nitrogen. Part 4. Further reactions of 1-chloro-2,3-diazabutadienes with S-nucleophiles
作者:William T. Flowers、John F. Robinson、David R. Taylor、Anthony E. Tipping
DOI:10.1039/p19810000349
日期:——
1-Chloro-1,4-diaryl-2,3-diazabutadienes (Ar1CClNNCHAr2), prepared by the reaction of thionyl chloride with aroylhydrazones (Ar1CONHNCHAr2), react with thiosemicarbazide or thiocarbohydrazide to give 2-arylidenehydrazino-5-aryl-1,3,4-thiadiazoles, and with potassium thiocyanate to give 1-thiocyanato-1,4-diaryl-2,3-diaza-butadienes which isomerize thermally to arylideneamino-5-aryl-1,3,4-thiadiazoles
Photoredox Fluoroalkylation of Hydrazones in Neutral and Reductive Modes
作者:Boris A. Worp、Mikhail D. Kosobokov、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1002/adsc.202001381
日期:2021.2.16
Visible light promoted fluoroalkylation of hydrazones using 4‐perfluoropyridine sulfides as fluoroalkyl radical sources is described. The process can proceed in neutral and reductive modes delivering either hydrazones or hydrazines, respectively, depending on structure of starting substrates and reaction conditions. For the reductive process, ascorbic acid is used as a terminal reductant, which recycles
Development of General Catalytic Allylation of Acylhydrazones with Pinacolyl Allylboronate Using an Indium(I) Catalyst
作者:Uwe Schneider、I-Hon Chen、Shū Kobayashi
DOI:10.1021/ol702756k
日期:2008.3.1
Catalytic allylation of various acylhydrazones using a group 13 metal reagent (boron) in combination with a group 13 metal catalyst in its low-oxidation state (indium) has been developed. This operationally simple carbon-carbon bond-forming reaction displays remarkable substrate scope and functional group tolerance.
An efficient oxidant-free, photoredox-mediated cascade cyclization strategy for the synthesis of 1,3,4-oxadiazoles by using an organo acridinium photocatalyst and a cobaloxime catalyst has been developed. Various acylhydrazones have been transformed into the corresponding 1,3,4-oxadiazole products in up to 96% yield, and H2 is the only byproduct. Mechanistic experiments and density functional theory