反应详情

Methyllithium (61 ml, 85 mmol) as a 1.4M solution in diethyl ether is added to 30 ml tetrahydrofuran and cooled to -78°. 1-Benzyl-4-[3-(1-cyano-1-methylethylamino)pyridyl]-piperazine (PREPARATION 95, 7.14 g, 21.28 mmol), dissolved in 30 ml cooled tetrahydrofuran, is cannulated into the methyllithium solution, rinsing in with 10 ml THF. The reaction is stirred at -78° and allowed to warm to 20°-25° overnight. The reaction is cautiously quenched with water, then extracted from water with methylene chloride. The extract is dried over sodium sulfate and concentrated. The concentrate is chromatographed on a 500 g silica gel column, eluting with ethyl acetate/hexane (2/3, v/v), the appropriate fractions are pooled and concentrated to give the title compound, NMR (300 MHz, CD3OD) 7.44, 7.43-7.07, 6.84-6.80, 3.49, 2.92, 2.52, 1.28 δ.

1. temperaturecooled to -78°
2. washrinsing in with 10 ml THF
3. temperatureto warm to 20°-25° overnight
4. customThe reaction is cautiously quenched with water
5. extractionextracted from water with methylene chloride
6. dry with materialThe extract is dried over sodium sulfate
7. concentrationconcentrated
8. customThe concentrate is chromatographed on a 500 g silica gel column
9. washeluting with ethyl acetate/hexane (2/3
10. concentrationconcentrated