6-cyclopropylmethoxy-5-(1-hydroxy-cyclobutyl)-pyridine-2-carboxylic acid 、
4,4-二氟-L-脯氨酰胺 盐酸盐 以to give the title compound (6 mg, 21%) as light yellow oil, LC-MS (UV peak area, ESI) 100%, 396.1740 [MH+]的产率得到(2S)-1-[6-(cyclopropylmethoxy)-5-(1-hydroxycyclobutyl)pyridine-2-carbonyl]-4,4-difluoropyrrolidine-2-carboxamide