Efficient Synthesis of 1,5-Disubstituted Tetrazoles
作者:Alan Katritzky、Chunming Cai、Nabin Meher
DOI:10.1055/s-2007-966001
日期:2007.4
A general method for the synthesis of 1,5-disubstituted tetrazoles from imidoylbenzotriazoles that involves mild reaction conditions and short reaction times.
Iron (III)‐porphyrin Complex FeTSPP as an efficient catalyst for synthesis of tetrazole derivatives
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[2 + 3]cycloaddition reaction in aqueous medium
作者:Mahmoud Abd El Aleem Ali Ali El‐Remaily、O.M. Elhady
DOI:10.1002/aoc.4989
日期:2019.8
metal complex (5,10,15,20‐tetrakis‐(4‐sulfonatophenyl)‐porphyrin‐iron (III) chloride (FeTSPP) was new employed in an environmentally benign protocol as an efficient catalyst for a “click” chemistry approach for the synthesis of tetrazole and guanindinyltetrazole derivatives via [2 + 3] cycloaddition reaction of nitriles and azide derivatives in aqueous medium. The synthesized compounds were obtained in
regioselective synthesis of 1,5-disubstituted tetrazoles has been developed. By means of electrophilic amide activation, and further C–C bond cleavage and rearrangement, a diverse set of functionalized 1,5-DST derivatives were selectively constructed under mild conditions. As showcased in the mechanisms, the chemoselectivity is easily switched by the selection of the starting materials in the reaction.
On treatment with an excess of sodium azide in the presence of titanium(IV) chloride in boiling acetonitrile, both aliphatic and aromatic ketones are smoothly converted to 1,5-disubstituted 1H-tetrazoles in high yields.
A novel method has been developed for the synthesis of 1,5-disubstituted tetrazoles from nitrones by using bis(p-nitrophenyl) phosphorazidate in the presence of 4-(dimethylamino)pyridine. By this approach, various nitrones were converted into the corresponding tetrazoles. This method permits the preparation of 1,5-disubstituted tetrazoles without the need for toxic or explosive reagents.