5-amino-1-ethylpyridin-2(1H)-one 、
6-[bis(tert-butoxycarbonyl)amino]-5-[(1R)-1-(2,6-dichloro-3-fluorophenyl)ethoxy]pyridazine-3-carboxylic acid 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66%的产率得到tert-butyl N-[4-[1-(2,6-dichloro-3-fluorophenyl)ethoxy]-6-[(1-ethyl-6-oxopyridin-3-yl)carbamoyl]pyridazin-3-yl]-N-[(2-methylpropan-2-yl)oxycarbonyl]carbamate