[CH3:1][O:2][C:3]([C:5]1([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)[CH2:10][CH2:9][NH:8][CH2:7][CH2:6]1)=[O:4].Br.Br[CH2:19][CH2:20][CH2:21][NH2:22].C(=O)([O-])[O-].[K+].[K+]>O1CCOCC1>[CH3:1][O:2][C:3]([C:5]1([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)[CH2:6][CH2:7][N:8]([CH2:19][CH2:20][CH2:21][NH2:22])[CH2:9][CH2:10]1)=[O:4]A mixture of 4-methoxycarbonyl-4-phenylpiperidine (8.5 g, 0.039 mol), 3-bromopropylamine hydrobromide (12.7 g, 0.058 mol), potassium carbonate (13.475 g, 0.0957 mole), and KI (3.24 g, 0.0195 mol) in 1,4-dioxane (200 mL) was stirred and refluxed for 24 hours. Dioxane was evaporated at reduced pressure, the residue was treated with ice-cold 6 N NaOH (400 mL) and extracted with CH2Cl2 (4×120 mL). Solvent was evaporated from the combined dried (K2CO3) extracts and the residue was purified by column chromatography on silica gel using CHCl3/MeOH/ 2 M NH3 in MeOH (20:2:1) as the eluent to afford the product as a viscous oil (7.8 g, 72%).
Wird geladen…
