tert-Butyl (2S)-2-methylpiperazine-1-carboxylate → HCID 67241966, compound

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Following General Procedure C, 7-cyclopentyl-2-(5-formyl-pyridin-2-ylamino)-7H-pyrrolo[2,3-d]pyrimidine-6-carboxylic acid dimethylamide (3.8 g, 10.05 mmol) and (S)-2-methyl-piperazine-1-carboxylic acid tert-butyl ester (5.03 g, 25.13 mmol) 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%) [following SiO2 chromatography, eluting with 50% EtOAc/petroleum ether). MS(ESI) m/z 563.3 (M+H)+

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