Benzyl [1-(3-methoxyphenyl)-1-methylethyl]carbamate → 2-(3-Methoxyphenyl)-2-propanamine

Participants

Reaction Steps

Into a round bottom flask, [1-(3-methoxy-phenyl)-1-methyl-ethyl]-carbamic acid benzyl ester (10.0 g, 33.4 mmol), ethanol (200 mL), and 10% Pd/C (1.20 g) were added. The mixture was evacuated under vacuum and charged with hydrogen via balloon (3 times). The reaction was stirred at room temperature overnight under a hydrogen atmosphere via a balloon. The solid was filtered and washed with Ethanol. The solvent was removed under vacuum to give 1-(3-Methoxy-phenyl)-1-methyl-ethylamine as a viscous oil 1-(3-methoxy-phenyl)-1-methyl-ethylamine (4.80 g, 0.0290 mol;) was treated with DMF and N,N-diisopropylethylamine (7.59 mL, 0.0436 mol) acetic acid, bromo-, 1,1-dimethylethyl ester (6.23 g, 0.0320 mol), respectively. The reaction mixture was stirred at 50° C. for 24 hours. The solvent was removed under vacuum. The reaction was partitioned with water and DCM. The organic was separated, washed with Brine, and dried over magnesium sulfate. The solid was filtered and washed with DCM. The solvent was removed under vacuum. The product was isolate via column chromatography with hexane and EtOAc as eluant (0 to 50%) to afford [1-(3-methoxy-phenyl)-1-methyl-ethylamino]-acetic acid tert-butyl ester as a white solid (5.86 g, 63%). 1H-NMR (CDCl3, 400 MHz): δ 7.22-7.28 (m, 1H), 6.97-7.02 (m, 2H), 6.75-6.80 (m, 1H), 3.80 (s, 3H), 3.06 (s, 2H), 1.44 (s, 6H), 1.42 (s, 9H).

Provenance & Evidence