、
4,5-二氯-2-(四氢-吡喃-2-基)-2H-吡嗪-3-酮 、
2,6-二氟苯酚 、
2-bromo-3-cyclobutyl-propionic acid methyl ester 以afforded 3-cyclobutyl-2-[4-(2,6-difluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-propionic acid as a white solid (520.5 mg, 82% for the final step)的产率得到3-cyclobutyl-2-[4-(2,6-difluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-propionic acid