Volume 45, Issue 4 pp. 1211-1214
Article

Facile routes to 1,2,4-triazolo[3,4-b][1,3,4]thiadiazines and 1,2,4-triazino[3,4-b][1,3,4]thiadiazine by heteropolyacides

Radineh Motamedi

Radineh Motamedi

Department of Chemistry, School of sciences, Payame nourUniversity, Delijan, Iran

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Majid M. Heravi

Majid M. Heravi

Department of Chemistry, School of sciences Azzahra University, Vanak, Tehran, Iran

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Fatemeh F. Bamoharram

Fatemeh F. Bamoharram

Department of Chemistry, Islamic Azad University-Mashhad Branch, Mashhad, Iran

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Anahita Haeri

Anahita Haeri

Department of Chemistry, School of sciences Azzahra University, Vanak, Tehran, Iran

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First published: 13 March 2009
Citations: 18

Abstract

chemical structure image

Cyclization of 4-amino-6-methyl-3-propargylmercapto-1,2,4-triazine-5-one 3 and 4-amino-3-propargyl mercapto-1,2,4-triazole derivatives 6 were afforded 1,2,4-triazino[3,4-b][1,3,4]thiadiazines 4 and 1,2,4-triazolo[3,4-b][1,3,4]thiadiazines 7 in presence of heteropolyacids, H14[NaP5W29MoO110] and H6P2W18O60 in high yields. Among used heteropoly acids, the yields were higher with H14-P5Mo, caused to their high acid strengths.

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