6-(cyclopropylmethoxy)-5-(3,3-difluoroazetidin-1-yl)pyridine-2-carboxylic acid 、
(±)-5-azaspiro[2.4]heptane-6-carboxamide hydrochloride 以to obtain the title compound (12 mg, 17%) as colorless oil, MS (EI)的产率得到(6S)-5-[6-(cyclopropylmethoxy)-5-(3,3-difluoroazetidin-1-yl)pyridine-2-carbonyl]-5-azaspiro[2.4]heptane-6-carboxamide