申请人:Chugai Seiyaku Kabushiki Kaisha
公开号:US06455708B1
公开(公告)日:2002-09-24
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。