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Synthesis of 1,2,4-triazines - XIV. Regioselective synthesis of ethyl 1,2,4-triazine-5-carboxylates

✍ Scribed by Tadashi Ohsumi; Hans Neunhoeffer

Publisher: Elsevier Science
Year: 1992
Tongue: French
Weight: 542 KB
Volume: 48
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(01)89020-7

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✦ Synopsis

Ethyl 1,2,4-triazine-5-carboxylates 6 were prepared by heating N,N-dimethylaminomethyleneor ethoxymethylenehydrazones 5 with ammonium acetate in acetic acid at-100°C. NMR-studies confirmed the absence of their regio isomers (6-carboxylates), showing the high regioselectivity of this procedure.

Recently we reported the regioselective synthesis of ethyl 1,2,4_triazine-T. OHSUMI and H. NELINHOEFFER Here we would like to report a regioselective synthesis of ethyl 1,2,4triazine-5-carboxylates6.

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