HCID 67498983, compound → HCID 67498472, compound

Participants

Reaction Steps

To a stirred solution of trans-N-Boc-2-methyl-6-(ethenyl propionyl)piperidine. (1.8 g, 3.36 mmol) in 15% trifloroacetic acid (35 mL) in dichloromethane was stirred for 2 h at room temperature, and the reaction mixture was quenched with 75 mL saturated NaHCO3 solution. The mixture was extracted with ether *5 and the combined extracts were dried over K2CO3 and then concentrated to give trans-2-methyl-6-(ethenyl propionyl)piperidine as an oil. The crude oil was immediately dissolved in a small amount of ether, and ether saturated with HCl (g) was added slowly via pipette. This solution was allowed to stand for 10 minutes, and the solvent was evaporated. More ether was added and the flask was swirled constantly until crystallization occured. The solid was collected via filtration, and dried in vacuo to give the piperidinium hydrochloride as a white solid. mp 154.8-156.3; 1H NMR (300 MHz) δ9.89 (s, 2H), 7.03 (dd, 1H), 6.24 (d, 1H), 4.24-4.11 (m, 3H), 3.45 (s, 1H), 2.2-1.49 (m, 9H), 1.26-1.22 (t, 3H); 13C NMR (75 MHz) δ165.1 (s), 140.1 (s), 126.3 (s), 60.83 (s), 54.3 (s), 51.8 (s), 48.6 (s), 29.4 (s), 27.9 (s), 26.3 (s), 17.9 (s), 14.1 (s) ppm. FT-IR (neat): 3374, 3107, 2943, 1717, 1683, 1635, 1539, 1436, 1312, 1190, 1033, 981. Elemental Analysis for C11H20NO2Cl: C, 56.52%; H, 8.64%; N, 5.99%. Found: C, 56.37%; H, 8.58%; N, 5.89%.

Provenance & Evidence