Process for preparing sulfonylureas

Details Process for preparing sulfonylureas Process for preparing sulfonylureas

1995-08-23

1996-08-27

Ford, John M.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544206, 544208, 544321, 544323, 544332, C07D25142, C07D25148, C07D23942, C07D23948

Patent

active

055502385

ABSTRACT:
This invention relates to a process for preparing sulfonylureas comprising reacting a sulfonyl chloride with a cyanate salt and an amine base in the presence of an inert aprotic solvent to give an isocyanate complex which is then reacted with an amino heterocycle to form the sulfonylurea product and a process for converting the crystal form of the prepared sulfonylurea product to a more stable crystal product form.

REFERENCES:
patent: 4546179 (1985-10-01), Kunz
patent: 5157119 (1992-10-01), Campopiano et al.
patent: 5480993 (1996-01-01), Choi et al.

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