(S)-tert-butyl [1-(5-{[3-acetyl-6-(3,5-dichloro-4-hydroxyphenyl)-1,5-naphthyridin-4-yl]amino}pyridin-2-yl)piperidin-3-yl]carbamate 、
三氟乙酸 、 以to afford the desired product (42 mg, 33% over two steps) as a yellow solid的产率得到(S)-1-(4-{[6-(3-Aminopiperidin-1-yl)pyridin-3-yl]amino}-6-(3,5-dichloro-4-hydroxyphenyl)-1,5-naphthyridin-3-yl)ethanone trihydrochloride