Trifluoroacetic acid → 1-(Piperidin-4-yl)-1,2,3,6-tetrahydropyridine

Beteiligte Stoffe

Reaktionsschritte

tert-Butyl 4-(5,6-dihydropyridin-1 (2H)-yl)piperidine-1-carboxylate (800 mg, 3 mmol) was dissolved in dichloromethane (54 ml). To this was added trifluoroacetic acid (7.9 ml) and triethyl silane (1.2 ml). The mixture was stirred at room temperature for 3 h. Solvent was removed from the mixture en vacuo. The residue was dissolved in saturated sodium bicarbonate (50 ml) and stirred for 30 min. Sodium hydroxide (50 ml, 50% in water) was added to the solution which was then extracted with dichloromethane (3×100 ml). The organic extract was dried over sodium sulfate and the solvent evaporated to give 370 mg (74%) as a colorless oil. 1H-NMR (CDCl3, 400 MHz) δ 5.74-5.70 (m, 1H), 5.68-5.64 (m, 1H), 3.14-3.07 (m, 4H), 2.64-2.53 (m, 4H), 2.43-2.37 (m, 1H), 2.15 (m, 2H), 1.85-1.82 (m, 2H), 1.73 (s, 1H), 1.47-1.38 (m, 2H).

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