73565-26-1Relevant articles and documents
Temperature dependent regioselective synthesis of aryl tetrazole amines using copper source
Murthy Boddapati,Emmanuel Kola,Kesana, Surendra Babu,Bollikolla, Hari Babu
, p. 177 - 183 (2018/05/09)
One pot highly efficient and simple protocol for the construction of aryl tetrazole amines via desulphurization/substitution/electro cyclization/C-N cross coupling reactions from thiourea with the use of cheap, readily available and air stable copper sour
Palladium catalyzed carbonylative annulation of the C(sp2)-H bond of N,1-diaryl-1H-tetrazol-5-amines and N,4-diaryl-4H-triazol-3-amines to quinazolinones
Chandrasekhar, Attoor,Ramkumar, Venkatachalam,Sankararaman, Sethuraman
, p. 8629 - 8638 (2018/12/12)
Pd(ii) catalyzed direct C-H carbonylative annulation of N,1-diaryl-1H-tetrazol-5-amines and N,4-diaryl-4H-1,2,4-triazol-3-amines gave the corresponding triazole and tetrazole fused quinazolinones in good yields. This methodology offers a convenient method for the synthesis of these important heterocyclic scaffolds in a highly atom economical process. On the mechanistic aspect weakly nucleophilic triazole and tetrazole moieties function as both directing as well as intramolecular nucleophiles. The catalytically active C-H activated intermediate dimeric Pd complex was isolated and characterized which on exposure to CO gas gave the corresponding tetrazole fused quinazolinone derivative. On the basis of isolation of the intermediate and observed kinetic isotope effects, a mechanism has been proposed for the C-H activated direct carbonylative annulation reaction.
Desulfurization strategy in the construction of azoles possessing additional nitrogen, oxygen or sulfur using a copper(I) catalyst
Guin, Srimanta,Rout, Saroj Kumar,Gogoi, Anupal,Nandi, Shyamapada,Ghara, Krishna Kanta,Patel, Bhisma K.
, p. 2757 - 2770 (2013/01/15)
A tandem and convergent approach to various N-, O-, or S-containing azoles has been developed by exploiting the thiophilic property of copper( I) iodide used in a catalytic quantity. The present protocol gives access to amino-substituted tetrazoles, triazoles, oxadiazoles and thiadiazoles via oxidative desulfurization of their respective precursors followed by inter- or intramolecular attack of suitable nucleophiles. For aminotetrazoles and triazoles an excellent regioselectivity has been achieved through proper tuning of the pKa values of the parent amines attached to unsymmetrical thioureas. The method represents an autocatalytic process in which copper( I) iodide gets converted to copper(II) sulfide which in turn transforms to active copper(II) oxide that effectively carries forward the catalytic cycle. The fate of the copper catalyst has also been studied using scanning electron microscopic (SEM) and energy-dispersive X-ray spectroscopic (EDS) analyses which give an insight into the mechanism for this catalytic process.