tert-butyl (5S)-3-oxo-2,3,5,6,7,8-hexahydro[1,2,4]triazolo[4,3-a]pyridine-5-carboxylate 、
2-(chloromethyl)-5-(trifluoromethyl)pyrazine 在
caesium carbonate 作用下,
以
乙腈 为溶剂,
以22%的产率得到tert-butyl (5S)-3-oxo-2-{[5-(trifluoromethyl)pyrazin-2-yl]methyl}-2,3,5,6,7,8-hexahydro[1,2,4]triazolo[4,3-a]pyridine-5-carboxylate