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An efficient synthetic method was proposed to synthesize some 2,3-position hybrid diarylethene derivatives. In these compounds, one of thiophene rings was attached to the ethylene moiety at 2-position, the other at 3-position. These asymmetric diarylethenes are sensitive at wavelengths in the...
We describe an efficient route towards the synthesis of fused bicyclic glutarimides using facile (3+3) reaction of α-sulfonylacetamides with different α,β-unsaturated esters as the key step. Intramolecular cyclization of 4-substituted 3-sulfonylglutarimide to form 5,6-, 6,6- or 6,7-fused...
For the first time, derivatives of 1,2,4-thiadiazoles have been obtained by the reaction of (bis(acyloxy)iodo)arenes with 1-monosubstituted thioureas. 1-Acetylthiourea is subject to intermolecular azacyclization to form 3,5-bis-(acetylamino)-1,2,4-thiadiazole in reaction with...
A simple one-pot procedure was elaborated for the preparation of hydroxylated benzofurans from halogenated phenols and was successfully applied to the first total synthesis of Cicerfuran, a natural defence agent of wild chickpea.
Acylation of antimalarial and bacteriostatic sulfonamides with N -protected amino acids and peptides was carried out using standard peptide coupling methods. These acylation reactions are regioselective for the N 4 nitrogen atom of diazine-containing sulfonamides. In contrast, only N 1 coupling...
The reaction of primary amines RNH 2 (R: Me, Et, i Pr, t Bu and Ph) with 1,2-dibromoethane gave N , N ′-disubstituted ethylenediamines R–NH–CH 2 CH 2 –NH–R ( 1 ) in yields ranging from 10% ( 1a ; R=Me) to 70% ( 1d , R= t Bu; 1e , R=Ph). Piperazines and N -substituted polyethyleneimines...
Stereoselective transformations of 2-chlorovinylsulfides in the presence of soluble ( t -BuOK) or insoluble (solid KOH or Cs 2 CO 3 /18-crown-6) base and palladium catalyst (dppb)Pd(OAc) 2 have been studied. Depending on the substrate or catalytic system, the reaction leads to the formation of (...
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