2-alkoxy-4-hydrazinopyrimidine compounds and their use in the pr

Details 2-alkoxy-4-hydrazinopyrimidine compounds and their use in the pr 2-alkoxy-4-hydrazinopyrimidine compounds and their use in the pr

1995-05-05

1996-10-08

Ford, John M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Pteroyl per se or having -c-, wherein x is chalcogen, bonded...

C07D48704

Patent

active

055632696

ABSTRACT:
5-Alkoxy-1,2,4-triazolo[4,3-c]pyrimidine-3(2H)-thione compounds, such as 5-ethoxy-8-fluoro-1,2,4-triazolo[4,3-c]pyrimidine-3(2H)-thione, were prepared by cyclization of 2-alkoxy-4-hydrazinopyrimidine compounds, such as 2-ethoxy-5-fluoro-4-hydrazinopyrimidine, with carbon disulfide and hydrogen peroxide. The reaction can be carried out in the presence of a trialkylamine, such as triethylamine, in which case a trialkylammonium salt is obtained. The products are useful intermediates in the preparation of 5-alkoxy[1,2,4]triazolo[1,5-c]-pyrimidine-2-sulfonamide herbicides.

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Broadbent et al., J. Chem. Soc., 1965, 3369-3372.
Miller et al., J. Chem. Soc., 1963, 5642-5659.
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