Diisopropylethylamine → Piperidine-1-carboxylic acid N'-(5-fluoro-pyridin-2-yl)-hydrazide

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Reaction Steps

1-Piperidine carbonyl chloride (348 mg, 0.30 mL, 2.36 mmol) was added dropwise to a solution of 5-fluoro-2-hydrazinyl-pyridine (see for reference WO2010/022076, which is incorporated herein by reference; 0.30 g, 2.36 mmol) and DIPEA (1.20 mL, 7.08 mmol) in DCM (10 mL) at RT under nitrogen and the mixture stirred for 2 h. The solution was washed with water (2×15 mL) and dried (Na2SO4). The solvent was evaporated and the residue triturated (diethyl ether) to afford Intermediate Da (475 mg, 84%). LCMS (Method 1): Rt 1.82 min, m/z 239 [MH+].

Provenance & Evidence