反应详情

To a mixture of powdered potassium hydroxide (356 mg) in dry dimethylsulfoxide (2 ml) under nitrogen is added a solution of 1-benzyl-4-(N-methyl-N-(3-hydroxymethyl-2-pyridyl)amino)piperidine (XXX, EXAMPLE 35, 494 mg) in dry dimethylsulfoxide (1.2 ml) followed by methyl iodide (118 μl). The resulting mixture is stirred at 20°-25° for 30 min and is then diluted with water (15 ml) and extracted with methylene chloride (2×20 ml). The combined organic phases are washed with water (2×10 ml) and saline (10 ml), dried over sodium sulfate and concentrated under reduced pressure to give a concentrate which is then chromatographed (silica gel, a gradient of ethyl acetate/hexane (20/80→40/60)) to give the title compound, NMR (CDCl3, 400 MHz) 8.22, 7.67, 7.31, 7.25, 6.89, 4.40, 3.50, 3.41, 3.28, 2.94, 2.77, 2.01, 1.86 and 1.70δ.

1. extractionextracted with methylene chloride (2×20 ml)
2. washThe combined organic phases are washed with water (2×10 ml) and saline (10 ml)
3. dry with materialdried over sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customto give
6. concentrationa concentrate which
7. customis then chromatographed (silica gel