1,2-Dichloroethane → 1-Dimethylamino-cyclopentanecarboxylic acid N'-(5-fluoro-pyridin-2-yl)-hydrazide

Participants

Reaction Steps

To a solution of (5-fluoro-pyridin-2-yl)-hydrazine (for reference procedure see WO 2010/022076, which is incorporated herein by reference in its entirety; 200 mg, 1.57 mmol) in DMF (10 mL) were added Intermediate 99a (247 mg, 1.57 mmol), EDC (333 mg, 1.73 mmol) and HOBt (21 mg, 0.16 mmol). The reaction mixture was stirred at RT for 18 h and then partitioned between EtOAc and water. The aqueous phase was further extracted with EtOAc (×3) and the combined organic layers were washed with brine, dried (MgSO4) and concentrated in vacuo. The resultant residue was purified by FCC on silica, using a gradient of 0-8% (2M NH3 in MeOH) in DCM, to give the title compound (282 mg, 67%). 1H NMR (400 MHz, CDCl3): 1.54-1.73 (4H, m), 1.76-2.04 (4H, m), 2.25 (6H, s), 6.46 (1H, s), 6.64 (1H, dd, J=9.0, 3.5 Hz), 7.23-7.33 (1H, m), 8.04 (1H, d, J=−3.0 Hz), 8.94 (1H, s).

Provenance & Evidence