2-氯-7-环戊基-N,N-二甲基-7H-吡咯并[2,3-d]嘧啶-6-甲酰胺 、
4-(6-aminopyridin-3-yl)-2-methylpiperazine-1-carboxylic acid tert-butyl ester 以gave 4-[6-(7-cyclopentyl-6-dimethylcarbamoyl-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino) pyridin-3-yl]-2-methyl-piperazine-1-carboxylic acid tert-butyl ester (260 mg, 97%) (following SiO2 chromatography, eluting with 0-3% MeOH/dichloromethane)的产率得到4-[6-(7-cyclopentyl-6-dimethylcarbamoyl-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino)-pyridin-3-yl]-2-methyl-piperazine-1-carboxylic acid tert-butyl ester