Regioselectivity in the Reactions of Bis-hydrazonoyl Halides with Pyrimidine-2-thiones |
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| Authors: | Ahmad S. Shawali Rifaat H. Hilal Said El-Sheikh |
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| Affiliation: | (1) Department of Chemistry, Faculty of Science, University of Cairo, Giza, Egypt, EG |
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| Abstract: | Summary. Bis-hydrazonoyl chlorides react regioselectively with pyrimidine-2-thiones, which contain a masked thiourea residue, to give the hitherto unknown annelated 2,3-bis-arylhydrazono-thiazoles and 3,3′-bis-1,2,4-triazoles. Reaction of bis-hydrazonoyl chlorides with 2-methylthio derivatives gave only 3,3′-bis-1,2,4-triazoles. Received October 4, 2000. Accepted (revised) December 20, 2000 |
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| Keywords: | . Hydrazones Nitrogen heterocycles Synthetic methods Thiazoles Triazoles. |
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