4-[1,1-dimethyl-3-(pyridin-3-yl)-2-propynyloxy]benzonitrile 在
silica gel 、
环己烷 作用下,
以
邻二氯苯 为溶剂,
反应 3.5h,
以there were obtained 6.7 g of 2,2-dimethyl-4-(3-pyridyl)-2H-1-benzopyran-6-carbonitrile of melting point 98°-99° C.的产率得到2,2-dimethyl-4-(pyridin-3-yl)-2H-1-benzopyran-6-carbonitrile