Process for the preparation of 2-pyridylsulfonylureas

Details Process for the preparation of 2-pyridylsulfonylureas Process for the preparation of 2-pyridylsulfonylureas

1993-02-26

1994-02-08

Ford, John M.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544207, 544209, 544198, 544320, 544324, 544331, 544113, 544122, 544123, 544 96, 544 63, C07D40112

Patent

active

052849457

ABSTRACT:
The process according to the invention for the preparation of herbicidal pyridylsulfonylureas of the formula (I) ##STR1## in which R.sup.1 to R.sup.5 and X are as defined in claim 1 comprises the reaction of the zwitterion (II) with the amino heterocycle (III) ##STR2## The novel zwitterionic 1,1,3-trioxo-1,2,4-thiadiazolo[4,5-a]pyridines can be obtained according to the invention by the reaction of phosgene with compounds IV, or the reaction of phosgene with compounds V ##STR3## in the presence of an alkyl isocyanate.

REFERENCES:
patent: 4789393 (1988-12-01), Hanagan

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