(5-Methyl-6-oxo-1,6-dihydro-pyridazin-3-yl)-acetic acid tert-butyl ester 、
3-Bromo-5-(2,3-difluoro-6-nitrophenoxy)pyridine 在
lithium hexamethyldisilazane 作用下,
以
四氢呋喃 为溶剂,
以60%的产率得到tert-butyl 2-[3-(5-bromopyridin-3-yl)oxy-2-fluoro-4-nitrophenyl]-2-(5-methyl-6-oxo-1H-pyridazin-3-yl)acetate