Tandem regioselective synthesis of tetrazoles and related heterocycles using iodine
作者:Ramesh Yella、Nilufa Khatun、Saroj Kumar Rout、Bhisma K. Patel
DOI:10.1039/c0ob01007c
日期:——
carbodiimides). The in situ generated heterocumulene on subsequent treatment with sodium azide at room temperature gave corresponding tetrazoles. The product regioselectivity for unsymmetrical 1,3-disubstituted thioureas was found to be correlated with the basicities (pKa's) of the parent amines attached to the thiourea. Aryl-sec-alkyl unsymmetrical thioureas gave thioamido guanidino products rather than the 5-aminotetrazoles