(R)-tert-butyl 1-(5-(3-acetyl-6-(3-chloro-5-fluoro-4-hydroxyphenyl)-1,5-naphthyridin-4-ylamino)pyridin-2-yl)piperidin-3-ylcarbamate 、
三氟乙酸 以to afford the desired product (56 mg, 67%) as a yellow-brown solid的产率得到(R)-1-{4-[6-(3-Aminopiperidin-1-yl)pyridin-3-ylamino]-6-(3-chloro-5-fluoro-4-hydroxyphenyl)-1,5-naphthyridin-3-yl}ethanone