申请人:CHUGAI SEIYAKU KABUSHIKI KAISHA
公开号:US20030065189A1
公开(公告)日:2003-04-03
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。