7-chloro-1-(2,4-difluorophenyl)-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid 、
rac-1-(trifluoromethoxy)propan-2-amine 在
N,N-二异丙基乙胺 、
Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以69%的产率得到rac-7-chloro-1-(2,4-difluorophenyl)-4-oxo-N-[1-(trifluoromethoxy)propan-2-yl]-1,4-dihydro-1,8-naphthyridine-3-carboxamide