Three series of substituted1,3,4-oxadiazoles were studied by (17)O NMR spectroscopy. Chemical shifts values were correlated with empirical Hammett parameters as well as calculated bond lengths and chemical shielding values.
A synthetic route to α-aminoketone derivatives via a heteroDiels–Alderreaction is described. Diacylhydrazine was oxidized by tert-butyl hypochlorite in the presence of pyridine. After evaporation, the heteroDiels–Alderreaction with diene was carried out without isolation of the azodicarbonyl compound. Quantitative heteroDiels–Alderreaction was possible with 1 equivalent of diene when Hf(OTf)4
One-pot synthesis of 1,3,4-thiadiazoles using Vilsmeier reagent as a versatile cyclodehydration agent
作者:Maaroof Zarei
DOI:10.1016/j.tet.2017.02.042
日期:2017.4
A simple and efficient synthetic method for the one-pot synthesis of 1,3,4-thiadiazoles utilizing Vilsmeierreagent was developed. In this method carboxylic acids and hydrazine were converted to 1,3,4-thiadiazoles in the presence of Vilsmeierreagent and Lawesson's reagent. The influence of the thionation reagent, solvent, temperature and time, in this reaction was discussed. The developed methodology
Rapid and Atom Economic Synthesis of Isoquinolines and Isoquinolinones by C-H/N-N Activation Using a Homogeneous Recyclable Ruthenium Catalyst in PEG Media
作者:Dewal S. Deshmukh、Neha Gangwar、Bhalchandra M. Bhanage
DOI:10.1002/ejoc.201900366
日期:2019.5.15
An atom‐efficient, rapid, green and sustainable approach has been developed for the synthesis of isoquinolines and isoquinolinones by annulation via C–H/N–N activation using a homogeneous recyclable rutheniumcatalyst in PEG media.
In Situ Generated Cetyltrimethylammonium Bisulphate in Choline Chloride–Urea Deep Eutectic Solvent: A Novel Catalytic System for One Pot Synthesis of 1,3,4-Oxadiazole
Cetyltrimethylammonium bisulphate ([CTA]HSO4) catalysed onepotsynthesis of 2,5-disubstituted-1,3,4-oxadiazoles from carboxylic acid and acid hydrazide in biodegradable deepeutecticsolvent is investigated. [CTA]HSO4 is generated in situ from cetyltrimethylammonium peroxodisulphate. Cyclization of diacylhydrazide using [CTA]HSO4 gives best alternative to traditional dehydration agents. Its remarkable