Preparation of 5-amino-1,2,4-triazole-3-sulfonamides

Details Preparation of 5-amino-1,2,4-triazole-3-sulfonamides Preparation of 5-amino-1,2,4-triazole-3-sulfonamides

1988-12-19

1995-01-17

Gerstl, Robert

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D24912

Patent

active

053826744

ABSTRACT:
5-Amino-l,2,4-triazole-3-sulfonamides, which are intermediates for substituted 1,2,4-triazolo-[1,5-a]pyrimidine-2-sulfonamide herbicides are prepared in two steps from 5-amino-3-mercapto-1,2,4-triazole by chlorination in a medium containing an aqueous acid to obtain 5-amino-3-chlorosulfonyl-1,2,4-triazole and subsequent condensation of this intermediate with substituted anilines. The condensation reaction takes place either in the presence or absence of an acid scavenging base.

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R. O. Robin, Jr. and J. W. Clapp, J. Am Chem. Soc., 72, 4890-4892 (1950).
R. G. Shepard, J. Organic Chem., 12, 275-283 (1947).

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