A simple and efficient method for the synthesis of pyrazole-fused porphyrins from readily available N-tosylhydrazones and 2-nitroporphyrins has been developed. This catalyst-free method can be applied to a wide range of substrates and demonstrate excellent tolerance to a variety of substituents.
of diazoalkanes derived from p-toluenesulfonylhydrazones to water under reflux and microwave conditions, in high yields. In addition, this protocol was successfully applied in the synthesis of deuterium-labeled alcohols using deuterium oxide. A novel library of diverse alcohols was synthesized by metal-free couplings of diazoalkanes derived from p-toluenesulfonylhydrazones to water under reflux and microwave
Carbenoid Etherifications Catalyzed by “Green” Silver Nanoparticles and Iron-Copper Nanoparticles
作者:Marco A. Garcia、Angel Garcia-Munoz、Josue A. Pena、Jessica Trujillo-Reyes、Raul A. Morales-Luckie、Miguel Avalos-Borja、Alfredo R. Vilchis-Nestor、Victor Sanchez-Mendieta、David Corona、Erick Cuevas-Yanez
DOI:10.2174/157017812799303971
日期:2012.1.1
Etherfication products were obtained from sodium salts of p-toluenesulfonylhydrazones in alcohol solutions at reflux temperature on treatment with catalytic amounts of iron-copper nanoparticles, and silver nanoparticles, which were prepared from Camellia sinensis natural extracts.
Benzofuran and indole synthesis via Cu(<scp>i</scp>)-catalyzed coupling of N-tosylhydrazone and o-hydroxy or o-amino phenylacetylene
作者:Tiebo Xiao、Xichang Dong、Lei Zhou
DOI:10.1039/c2ob26867a
日期:——
A general and practical method to synthesize 2-substituted benzofurans and indoles is described. This method employs easily accessible N-tosylhydrazones and o-hydroxy or o-amino phenylacetylenes as substrates. The reaction proceeds through a CuBr-catalyzed coupling–allenylation–cyclization sequence under ligand-free conditions.
ONE-POT OXIDATION OF AZOMETHINE COMPOUNDS INTO ARENECARBOXYLIC ACIDS
作者:Mirosław Giurg、Samy B. Said、Ludwik Syper、Jacek Młochowski
DOI:10.1081/scc-100105891
日期:2001.1
Aromatic azomethine compounds, such as aldazines 1, aldoximes 7 and tosylhydrazones 8 oxidized with 30% hydrogen peroxide in the presence of poly(bis-1,2-phenylene) diselenide (6) as catalyst produce arenecarboxylic acids 2 mostly in high to excellent yields. The presented one-pot procedure has a synthetic value.