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.
The Effect of Some Substituents on the Thermal Breakdown of Diaryltetrazoles<sup>1</sup>
作者:JOHN VAUGHAN、PETER A. S. SMITH
DOI:10.1021/jo01106a023
日期:1958.12
Direct C−H Arylation and Alkenylation of 1-Substituted Tetrazoles: Phosphine As Stabilizing Factor
作者:Marcel Špulák、Richard Lubojacký、Petr Šenel、Jiří Kuneš、Milan Pour
DOI:10.1021/jo902180u
日期:2010.1.1
Direct arylation and alkenylation of 1-substituted tetrazoles was achieved via Pd catalysis in the presence of CuI and CS2CO3. Unlike the related reactions of imidazoles and purines, phosphine ligand was necessary to prevent the intermediate tetrazolyl-Pd-II species from fragmentation into the corresponding cyanamide, Various 1,5-disubstituted tetrazoles were prepared with good to excellent isolated yields.