3-cyclobutyl-2-[4-(2,6-difluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-propionic acid 在
(benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以51%的产率得到3-cyclobutyl-2-[4-(2,6-difluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-N-[1-(2-hydroxy-2-methyl-propyl)-1H-pyrazol-3-yl]-propionamide