5-cyclopropyl-6-(2,2,3,3,3-pentafluoro-propoxy)-pyridine-2-carboxylic acid 、
4,4-difluoro-D-prolinamide hydrochloride 以isolated (38 mg, 89%) as white solid的产率得到(R)-1-[5-cyclopropyl-6-(2,2,3,3,3-pentafluoropropoxy)pyridine-2-carbonyl]-4,4-difluoropyrrolidine-2-carboxylic acid amide