2,5-dioxopyrrolidin-1-yl (tetrahydrofuran-3-yl)methyl carbonate 、 (S)-2-(5-chloro-1H-pyrrolo[2,3-b]pyridin-3-yl)-5-fluoro-N-(1-(methylsulfonyl)pyrrolidin-3-yl)pyrimidin-4-amine 以10%的产率得到(3S)-(tetrahydrofuran-3-yl)methyl 3-(2-(5-chloro-1H-pyrrolo[2,3-b]pyridin-3-yl)-5-fluoropyrimidin-4-ylamino)pyrrolidine-1-carboxylate