Methyl iodide → HCID 9901062, compound

Participants

Reaction Steps

A solution of 2-(4-fluorophenyl)-3-(4-pyrimidinyl)-pyrazolo[1,5-a]pyridine (Example 1, 0.2 g, 0.69 mmol) in dry tetrahydrofuran (5 mL) was cooled to −78° C. under nitrogen and lithium diisopropylamide (0.45 mL of a 2M solution in heptane/tetrahydrofuran/ethylbenzene, 0.9 mmol) was added dropwise. The reaction mixture was stirred for about 10 minutes and methyl iodide (0.2 mL, 4 mmol) was added. The solution was allowed to warm to room temperature and stirred for a further 1.5 hours. The reaction mixture was diluted with diethyl ether (20 mL), water (20 mL) added, and the organic phase separated. The aqueous phase was further extracted with ether (20 mL) and the combined ether phases were dried over anhydrous magnesium sulfate, filtered and the solvents evaporated to give a yellow solid. Chromatography on silica gel eluting with 9:1 hexane/ethyl acetate gave the title compound, 0.080 g (38%). 1H NMR (DMSO-d6): δ 2.72 (s, 3H), 7.05 (d, J=6.3 Hz, 2H), 7.32 (t, J=8.8 Hz, 2H), 7.46 (dd, J=7.0, 8.6 Hz, 1H), 7.61 (dd, J=5.5, 8.6 Hz, 2H), 8.32 (d, J=9.0 Hz, 1H), 8.52 (d, J=5.5 Hz, 1H), 9.15 (s, 1H); APESI+MS m/z 305 (M+1)−.

Provenance & Evidence