5-tert-butyl-2-(3-(5-(1-ethyl-1H-pyrazol-3-ylamino)-1-methyl-6-oxo-1,6dihydropyridazin-3-yl)-2-(hydroxymethyl)phenyl)isoindolin-1-one 、
6-chloro-2-methyl-4-(pyrimidin-4-ylamino)pyridazin-3(2H)-one 、 2-(5-tert-butyl-1-oxoisoindolin-2-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl acetate 以afforded 103 in 49% yield (196 mg) as an amorphous off-white solid的产率得到5-tert-butyl-2-(2-(hydroxymethyl)-3-(1-methyl-6-oxo-5-(pyrimidin-4-ylamino)-1,6-dihydropyridazin-3-yl)phenyl)isoindolin-1-one