作者:Yongping Yu、John M. Ostresh、Richard A. Houghten
DOI:10.1016/j.tetlet.2004.07.160
日期:2004.10
A solid-phase synthesis of 5-aminotetrazoles is described. Resin-bound thioureas were displaced by sodium azide in the presence of HgCl2 and following nucleophilic cyclization produced the resin-bound products. The desired 5-aminotetrazoles were cleaved from the resin using 95% trifluoroacetic acid in dichloromethane in good yield and purity.
Aminotetrazole Synthesis from Secondary Amides by C–C Bond Nitrogenation
作者:Ning Jiao、Cheng Zhang、Jianzhong Liu、Zengrui Cheng、Junhua Li、Song Song
DOI:10.1055/a-2006-4548
日期:——
The development of novel methods for the preparation of aminotetrazoles is of long-standing interest to chemists due to the great importance of these compounds in chemistry and biology. Here, we report an efficient method for the preparation of aminotetrazoles fromsecondaryamides by selective C–C bond cleavage. Compared with the conventional laborious and cumbersome approaches to aminotetrazoles
An expedient route to the azoles through oxidative desulfurization using iodine reagent
作者:Nikhil C. Jadhav、Prashant B. Jagadhane、Kavitkumar N. Patel、Vikas N. Telvekar
DOI:10.1016/j.tetlet.2012.10.114
日期:2013.1
A novel and expedient regioselective method for the synthesis of 5-aminotetrazoles and 3-amino-1,2,4-triazoles through oxidative desulfurization of corresponding 1,3-disubstituted thioureas has been discovered and optimized for the process conditions. The process is broadly applicable to structurally diverse 1,3-disubstituted thioureas. (C) 2012 Elsevier Ltd. All rights reserved.
<i>o</i>-Iodoxybenzoic Acid Mediated Oxidative Desulfurization Initiated Domino Reactions for Synthesis of Azoles
作者:Pramod S. Chaudhari、Sagar P. Pathare、Krishnacharaya G. Akamanchi
DOI:10.1021/jo2025509
日期:2012.4.20
A systematic exploration of thiophilic ability of o-iodoxybenzoic acid (IBX) for oxidative desulfurization to trigger domino reactions leading to new methodologies for synthesis of different azoles is described. A variety of highly substituted oxadiazoles, thiadiazoles, triazoles, and tetrazoles have been successfully synthesized in good to excellent yields, starting from readily accessible thiosemicarbazides, bis-diarylthiourea, 1,3-disubtituted thiourea, and thioamides.