| 摘要 |
The invention comprises compounds of general formula <FORM:1110645/C2/1> wherein R1 and R2, which may be the same or different are hydrogen or halogen atoms or alkyl, alkoxy, alkylmercapto, acyl, azido or trifluoromethyl radicals, and the salts thereof. A first method of preparation comprises reacting a compound of general Formula II with a compound of general Formula III <FORM:1110645/C2/2> wherein one of X and Y is an amino group, while the other is an isocyanate group or a residue converted into an isocyanate group under the reaction conditions. A second method of preparation comprises hydrolysing a compound of general Formula IV, V or VI. <FORM:1110645/C2/3> <FORM:1110645/C2/4> <FORM:1110645/C2/5> A third method of preparation comprises reacting a compound of general Formula VII <FORM:1110645/C2/6> wherein R1 and R2 have the above meanings, with a compound of general Formulaae VIII or IX <FORM:1110645/C2/7> <FORM:1110645/C2/8> |
