trans-4-(acetamido)-3-(t-butyldimethylsilyloxy)-6-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran 、
4-氟苯甲亚胺酸乙酯盐酸盐 、
(3R-trans)-4-amino-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile 以
乙醇 、
二氯甲烷 为溶剂,
生成
ethyl N-acetyl-4-fluorobenzimidate 、 N'-acetyl-N-(trans-6-cyano-3,4-dihydro-2,2-dimethyl-3-hydroxy-2H-1-benzopyran-4-yl)-4-fluorobenzamidine