Synthesis of fluoromethyl,difluoromethyl and trifluoromethyl analogues of pyrazosulfuron-ethyl as herbicides |
| |
Authors: | Katsushi Morimoto Kenzi Makino Susumu Yamamoto Gozyo Sakata |
| |
Abstract: | Ethyl 1-fluoromethyl-5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)pyrazole-4-carboxylate 1b , a new fluoromethyl analogue of the herbicide pyrazosulfuron-ethyl la, was prepared from ethyl 1-fluoromethylpyrazole-4-carboxylate 4b . The difluoromethyl and trifluoromethyl analogues 1c,d were also synthesized from ethyl pyrazole-4-carboxylate 2 via difluorocarbene reaction. |
| |
Keywords: | |
|
|