8-methyl-6-[2-methyl-5-(3-methyl-isoxazol-5-yl)-phenyl]-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one 、 Potassium;oxido hydrogen sulfite 、 、
4-氨基四氢吡喃 以to give 8-Methyl-6-[2-methyl-5-(3-methyl-isoxazol-5-yl)-phenyl]-2-(tetrahydro-pyran-4-ylamino)-8H-pyrido[2,3-d]pyrimidin-7-one的产率得到8-methyl-6-[2-methyl-5-(3-methyl-isoxazol-5-yl)-phenyl]-2-(tetrahydro-pyran-4-ylamino)-8H-pyrido[2,3-d]pyrimidin-7-one