4-nitrophenyl 3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazine-7(8H)-carboxylate 、 (R)-tert-butyl (4-amino-1-(2,4,5-trifluorophenyl)butan-2-yl)carbamate 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 14.0h,
以62%的产率得到(R)-tert-butyl (4-(3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrazine-7-carboxamido)-1-(2,4,5-trifluorophenyl)butan-2-yl)carbamate