ethyl N-cyano-4-(trifluoromethyl)benzimidate 、
(3R-trans)-4-amino-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile 以
乙醇 、
水 为溶剂,
生成 N'-cyano-N-(trans-6-cyano-3,4-dihydro-2,2-dimethyl-3-hydroxy-2H-1-benzopyran-4-yl)-4-(trifluoromethyl)benzamidine