6-(cyclopropylmethoxy)-5-(1-fluorocyclobutyl)pyridine-2-carboxylic acid 、
4,4-二氟-L-脯氨酰胺 盐酸盐 以to give the title compound (18 mg, 91%) as off-white solid, MS (EI)的产率得到(2S)-1-[6-(cyclopropylmethoxy)-5-(1-fluorocyclobutyl)pyridine-2-carbonyl]-4,4-difluoropyrrolidine-2-carboxamide