[O:1]=[C:2]1[NH:7][C:6]2[CH:8]=[CH:9][CH:10]=[C:11]([CH2:12][CH:13]3[CH2:18][CH2:17][N:16]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[CH2:15][CH2:14]3)[C:5]=2[O:4][CH2:3]1.[H-].[Na+].I[CH3:29]>CN(C)C=O>[CH3:29][N:7]1[C:6]2[CH:8]=[CH:9][CH:10]=[C:11]([CH2:12][CH:13]3[CH2:14][CH2:15][N:16]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[CH2:17][CH2:18]3)[C:5]=2[O:4][CH2:3][C:2]1=[O:1]A solution of tert-butyl 4-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-8-ylmethyl)piperidine-1-carboxylate (0.6 g, 1.73 mmol) in anhydrous N,N-dimethylformamide (1 mL), was added dropwise to a stirred suspension of sodium hydride (60%) (0.08 g) in anhydrous N,N-dimethylformamide (12 mL) at 0° C. Stirring was continued for a further 20 mins. before iodomethane (0.5 g) in anhydrous N,N-dimethylformamide (1 mL) was added. The mixture was allowed to stir at room temperature for 4 hours. It was quenched with saturated ammonium chloride (20 mL) and extracted with diethyl ether (100 mL). The organic layer was dried (Na2SO4) and evaporated in vacuo to give a crude oil. Silica gel chromatography eluting with ethyl acetate in hexane (10–20%) gave the title compound as a solid (0.6 g, 97%).
Wird geladen…
