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)

Patent

CA 2158690

Alkoxytriazolinones of the general formula (I), Image 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 iminothiocarbonic diester (II) with carbazinic esters (III) Image in which R3 and R4 in each case represent, for example, alkyl or aryl, at - 20°C to +50°C (1st step) and subjecting the semicarbazide derivatives (I) formed in this process with elimination of R3-SH Image to a cyclizing condensation reaction and if appropriate 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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