7-cyclopentyl-2-(5-formyl-pyridin-2-ylamino)-7H-pyrrolo[2,3-d]pyrimidine-6-carboxylic acid dimethylamide 、
(S)-1-N-Boc-2-甲基哌嗪 以gave (S)-4-[6-(7-cyclopentyl-6-dimethylcarbamoyl-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino)-pyridin-3-ylmethyl]-2-methyl-piperazine-1-carboxylic acid tert-butyl ester as a white solid (2.45 g, 45%) [的产率得到(S)-4-[6-(7-cyclopentyl-6-dimethylcarbamoyl-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino)-pyridin-3-ylmethyl]-2-methyl-piperazine-1-carboxylic acid tert-butyl ester