Process for the preparation of 1-carbamoyl-3-(3,5-dichlorophenyl)-hydantoin, and 1-chlorocarbonyl-3-(3,5-dichlorophenyl) hydantoin as intermediate in this process.

摘要

1. Process for the manufacture of N-substituted 1-carbamoyl-3-(3,5-dichlorophenyl)-hydantoins of the formula: IMAGE (I) in which R1=alkyl (C1-C4) or phenyl and R2=H or alkyl (C1-C4). 2. This process comprises two steps: a. reacting phosgene with 3-(3,5-dichlorophenyl)-hydantoin in an inert organic solvent medium, in the presence of an acid acceptor, in order to form 1-chlorocarbonyl-3-(3,5-dichlorophenyl)-hydantoin, and b. reacting the chlorocarbonyl formed with an amine HNR1R2 in an inert organic solvent, in the presence of an acid acceptor. 3. This process makes it possible to obtain the products I, which can be used as agricultural fungicides, with good yields.