6-cyclopropylmethoxy-5-(3,3-difluoro-azetidin-1-yl)-pyrazine-2-carboxylic acid 、
(2S)-4-hydroxy-4-methylpyrrolidine-2-carboxamide hydrochloride 以to obtain the title compound (12 mg, 13%) as light yellow oil, MS (ESI) 412.3 [MH+]的产率得到(2S)-1-[6-(cyclopropylmethoxy)-5-(3,3-difluoroazetidin-1-yl)pyrazine-2-carbonyl]-4-hydroxy-4-methylpyrrolidine-2-carboxamide