Patent ID: 6723875
Filing Date: 2004-04-20
Classification: C07C

Abstract:
A process for preparing alkyl-ureas, starting from O,S-dimethyl dithiocarbonate, having the following formula (1): comprising the following steps:A) reacting O,S-dimethyl dithiocarbonate (1) with a primary amine of formula R1NH2, where R1 is alkyl, cycloalkylic or arylalkyl, so as to obtain an O-methyl thiocarbamate of formula (2): B) isomerising the O-methyl thiocarbamate of formula (2), so as to obtain an S-methyl thiocarbamate of formula (3): C) reacting the S-methyl thiocarbamate of formula (3) with a compound of formula Râ€²Râ€³NH, where Râ€² and Râ€³ are H, R2 or R3, where R2 and R3 are alkyl, cycloalkyl or arylalkyl and can be the same or different and can be the same as or different from R1, so as to obtain one of the alkyl-ureas (4), (5) or (6):