6-(cyclopropylmethoxy)-5-(3,3-difluoroazetidin-1-yl)pyridine-2-carboxylic acid 、
(2S)-4-hydroxy-4-methylpyrrolidine-2-carboxamide hydrochloride 以to obtain the title compound (22 mg, 76%) as off-white solid的产率得到(2S)-1-[6-(cyclopropylmethoxy)-5-(3,3-difluoroazetidin-1-yl)pyridine-2-carbonyl]-4-hydroxy-4-methylpyrrolidine-2-carboxamide