反应详情

To a solution of ethyl 2-(6-chloropyridazin-3-yl)propanoate (2.8 g, 13.04 mmol) in THF (28 mL) was added lithium hexamethyldisilazide (1.0 molar in THF, 15.65 mL, 15.65 mmol) at −70° C. in dropwise fashion. The reaction was stirred at −70 for 30 min and then iodomethane (0.816 mL, 13.04 mmol) was added. The reaction was stirred for 2 hrs as allowed to warm to room temperature. The reaction was concentrated to dryness via rotary evaporation and the resulting material was purified by MPLC (98:2, DCM:MeOH) to provide the title compound, ethyl 2-(6-chloropyridazin-3-yl)-2-methylpropanoate (54B, 2.82 g, 95%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.11 (t, J=7.07 Hz, 3 H) 1.58 (s, 6 H) 4.08 (q, J=7.07 Hz, 2 H) 7.83-7.97 (m, 2 H).

1. stirringThe reaction was stirred for 2 hrs
2. concentrationThe reaction was concentrated to dryness via rotary evaporation
3. customthe resulting material was purified by MPLC (98:2, DCM:MeOH)