2-phenyl-5-(pyrazin-2-yl)-4,5,6,7-tetrahydrooxazolo[4,5-c]pyridine 、
2-氯-3-氰基吡嗪 在
3-(2-phenyl-6,7-dihydrooxazolo[4,5-c]pyridin-5(4H)-yl)pyrazine-2-carbonitrile 、 Silica gel 作用下,
以
hexanes 、
乙酸乙酯 为溶剂,
生成 3-(2-phenyl-6,7-dihydrooxazolo[4,5-c]pyridin-5(4H)-yl)pyrazine-2-carbonitrile