Process for preparing substituted oxadiazolones

Details Process for preparing substituted oxadiazolones Process for preparing substituted oxadiazolones

C - Chemistry, Metallurgy

07

D

C07D 271/113 (2006.01) C07C 241/04 (2006.01) C07C 243/28 (2006.01)

Patent

CA 2234518

Substituted oxadiazolones of the formula (I), (see formula I) in which R represents optionally substituted alkyl [which are known as intermediates for the preparation of certain herbicides] are obtained in good yields and high purity when in a first step carboxylic acids of the general formula (II) R-COON (II) are reacted with hydrazine hydrate in the presence of a catalyst and, if appropriate, in the presence of an inert diluent at temperatures between 0°C and 150°C with elimination of water, and the resulting carboxylic hydrazides of the general formula R-CO-NH-NH2 (III) are reacted in a second step in the same reaction medium - i.e. without isolation of the intermediate - with phosgene (COCl2) at temperatures between 20°C and 120°C.

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