Starting, for example, from 1-fluoro-2-fluoromethyl-3-butyn-2-yl 4-trifluoromethylphenyl; ether, N-(2-cyanoethyl)-5-fluoro-4-fluoromethyl-4-(4-trifluoromethylphenoxy)-2-pentynamide is produced and then cyclized to synthesize 2,2-bis(fluoromethyl)-N-(2-cyanoethyl)-6-trifluoromethyl-2H-1-benzopyran-4-carboxamide. The invention processes for producing 4-substituted benzopyran derivatives involve fewer steps, feature greater safety and allow for easier purification than the prior art processes.
例如,从1-
氟-2-
氟甲基-3-丁炔-2-基-4-三
氟甲基苯基醚开始;产生N-(2-
氰乙基)-5-
氟-4-
氟甲基-4-(4-三
氟甲基苯氧基)-
2-戊炔酰胺,然后环化合成2,2-双(
氟甲基)-N-(2-
氰乙基)-6-三
氟甲基-2H-1-苯并
吡喃-4-甲酰胺。本发明的生产4-取代苯并
吡喃衍
生物的工艺步骤比现有技术的工艺步骤更少,具有更高的安全性,并且比以往更容易纯化。