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.
以1-
氟-2-
氟甲基-3-丁炔-2-基-4-三
氟甲基苯醚为起始物,生产N-(2-
氰基乙基)-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-
氰基乙基)-6-三
氟甲基-2H-1-
苯并
吡喃-4-羧
酰胺。该发明生产4-取代
苯并
吡喃衍
生物的工艺步骤较少,更安全,并且易于纯化,比现有技术工艺更具优势。