Tetrahedron

Pyrolytic desulfurization ring contraction of condensed thiadiazines as a general route towards pyrazoloazines and pyrazoloazoles with a bridgehead (ring junction) …

YA Ibrahim, NA Al-Awadi, E John

Index: Ibrahim, Yehia A.; Al-Awadi, Nouria A.; John, Elizabeth Tetrahedron, 2008 , vol. 64, # 45 p. 10365 - 10374

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Citation Number: 12

Abstract

Pyrolytic conversion of [1, 2, 4] triazino [3, 4-b][1, 3, 4] thiadiazin-4-ones,[1, 3, 4] thiadiazino [2, 3-b] quinazolin-10-ones and [1, 2, 4] triazolo [3, 4-b][1, 3, 4] thiadiazines into their corresponding pyrazolo [5, 1-c][1, 2, 4] triazin-4-ones, pyrazolo [4, 3-b] quinazolin-9-ones and pyrazolo [5, 1-b][1, 2, 4] triazoles via desulfurization ring contraction is described. The starting condensed 1, 3, 4-thiadiazines were prepared from the corresponding readily ...