Borane;pyridine → HCID 178461422, compound

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Reaction Steps

The product of Example 1C (500 mg, 1.77 mmole) was dissolved in 6 ml dichloromethane and 4 ml ethanol. 2-(S)-methylpyrrolidine (1.04 g, 4.43 mmole, toluene extract from 50% sodium hydroxide) was then added and the solution was stirred at room temperature for 30 minutes. Borane-pyridine (358 μl, 3.54 mmole) was added, and the mixture was stirred at room temperature overnight. The reaction was quenched with saturated sodium bicarbonate and extracted three times with dichloromethane. The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated to give the crude product which was purified by column chromatography (0.4% ammonium hydroxide and 4% methanol in dichloromethane) to give 98 mg (16% yield) of the title compound. 1H NMR (500 MHz, CDCl3) δ ppm 7.98 (d, J=2.14 Hz, 1H) 7.80 (d, J=8.85 Hz, 1H) 7.54 (dd, J=8.54, 1.83 Hz, 1H) 3.54-3.65 (m, 1H) 3.15-3.29 (m, 1H) 3.00-3.12 (m, 1H) 2.74-2.85 (m, 1H) 2.58-2.68 (m, 1H) 2.43-2.56 (m, 3H) 2.30-2.39 (m, 1H) 1.92-2.02 (m, 1H) 1.78-1.89 (m, 1H) 1.70-1.76 (m, 1H) 1.44-1.59 (m, 1H) 1.16 (s, 3H). MS: (M+H)+=351/353.

Provenance & Evidence