Sodium Hydroxide → CID 136342890

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To a suspension of 4-chloro-7H-pyrrolo[2,3-d]pyrimidine-5-carbaldehyde (1.17 g, 6.47 mmol, 1.0 eq) and hydroxylamine hydrochloride (0.54 g, 7.77 mmol, 1.2 eq) in EtOH (25 mL), aqueous NaOH solution (0.31 g, 7.77 mmol, 1.2 eq) in H2O (4 mL) was added dropwise. The resulting mixture was stirred at RT for 30 min and then was diluted with a sufficient amount of EtOH to allow stirring for additional 30 min. The solid was collected by filtration, rinsed with H2O and dried in vacuo to afford 4-chloro-7H-pyrrolo[2,3-d]pyrimidine-5-carbaldehyde oxime (0.89 g, 70% yield) as a mixture of isomers. ESI-MS m/z: 194.8 [M−H]−.

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