Process for the preparation of alkoxytriazolinones

Details Process for the preparation of alkoxytriazolinones Process for the preparation of alkoxytriazolinones

C - Chemistry, Metallurgy

07

D

C07D 249/12 (2006.01) C07C 281/06 (2006.01)

Patent

CA 2158691

Alkoxytriazolinones of the general formula (I), (see formula I) in which R1 and R2 independently of one another represent in each case optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aryl or arylalkyl, (which can be used as intermediates for the preparation of herbicidal active compounds) are obtained in very good yields and in high purity by reacting iminocarbonic diesters (II) with carbazinic esters (III) (see formula II, III, IV) in which R3 and R4 in each case represent, for example, alkyl or aryl, at -20°C to + 120°C (1st step) and subjecting the semicarbazide derivatives (IV) formed in this process with elimination of R3-OH (see formula (VI, I) to a cyclizing condensation reaction in the presence of a base at +20°C to 100°C with elimination of R4-OH, if appropriate after intermediate isolation (2nd step).

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