| abstract |
Pyrido[2,3-d]pyrimidin-2,4(1H,3H)-diones are disclosed, having formulas (Ia) and (Ib), in which R?1 and R?2 stand for H, substituted or unsubstituted alkyl, cycloalkyl; R?3 stands for H, substituted or unsubstituted alkyl; R?4 stands for H, alkyl, alkoxycarbonyl, (alkylthio)carbonyl, alkoxy(thiocarbonyl), (alkylthio)thiocarbonyl, cyano or aminocarbonyl; or R?3 and R?4 represent together alkylene, alkenylene or 1,2-phenylene; R?5 stands for H, alkyl, cyano, C(O)R?7; R?6 stands for alkyl, possibly substituted aralkenyl, aryl or hetaryl, CH2?R?8, alkoxycarbonyl, (alkylthio)carbonyl, alkoxy(thiocarbonyl), (alkylthio)thiocarbonyl, OH, SH, alkoxy, alkylthio, NH2?, alkylamino, NHCXR?9, NHSO2?R?10; R?5 and R?6 represent together substituted alkylene, alkenylene or 1,2-phenylene, which may also contain carbonyl or thiocarbonyl groups; R?7 stands for H, alkyl, OH, SH, alkoxy, alkylthio, alkoxycarbonyl, (alkylthio)carbonyl, alkoxy(thiocarbonyl), (alkylthio)thiocarbonyl, NH2? alkylamino, dialkylamino, possibly substituted aryl or arylamino; R?8 stands for halogen, OH, SH, alkoxy, alkylthio, alkoxycarbonyl, (alkylthio)carbonyl, alkoxy(thiocarbonyl), (alkylthio)thiocarbonyl or the formula (a); R?9 stands for alkyl, halogen alkyl, NR?1R?2 or OR?1; R?10 stands for alkyl, substituted or unsubstituted aryl; R?11 stands for halogen, OH, SH, alkoxy, alkylthio, alkyl, nitro or amino; X stands for oxygen or sulphur. Also disclosed are the salts of compounds (Ia) and (Ib) that can be used in agriculture and that contain nitrogen or hydroxy substituants, as well as herbicides that contain 2-[4-(hetero)-aryloxy]-phenoxyacetic acid or propionic acid derivates and/or cyclohexenone derivates as active herbicidal substances and substituted pyrido[2,3-d[pyrimidin-2,4(1H, 3H)-diones, as well as the salts of (Ia) or (Ib) as antidotes when acid end groups or basic nitrogen atoms are present. |