HCID 69013717, compound → HCID 58777586, compound

Participants

Reaction Steps

The [3-(4-amino-phenyl)-2-hydroxy-propyl]-ethyl-carbamic acid tert-butyl ester was prepared by the following procedure: To a stirred solution of 1-allyl4-nitrobenzene (2.85 g, 17.47 mmol; prepared by the procedure of EP 1013636 A, 1999) in dichloromethane (100 mL) at room temperature was added 3-chlorperoxybenzoic acid (6.03 g, 57-86%, Aldrich) and the mixture stirred overnight. The solution was washed with excess aqueous sodium thiosulfate, then with aqueous sodium bicarbonate solution and the organic solution was dried (magnesium sulfate), evaporated, and chromatographed on silica gel giving 1.94 g (62%) of 24-nitorbenzyloxirane as a yellow oil. This oil (0.92 g 5.13 mmol) in methanol was stirred overnight at room temperature with aqueous ethylamine (2 mL, 70% in water, Aldrich). The methanol was removed by evaporation and the residue was dissolved in 1N aqueous hydrochloric acid. The aqueous solution was washed with ether and the aqueous layer was made basic with 4N aqueous sodium hydroxide. Tetrahydrofuran was added to dissolve the solids and di-tert-butyl dicarbonate (1.35 g, 6.16 mmol, Aldrich) was added and the mixture stirred at room temperature for 2 hours. The reaction was extracted with dichloromethane, dried (magnesium sulfate), evaporated and chromatographed on silica gel to give ethyl-[2-hydroxy-3-(4-nitro-phenyl)-propyl]carbamic acid tert-butyl ester as a yellow oil, 1.23 g, 74%. MS(ES) (M+H)+=325. This nitro compound (1.06 g, 3.26 mmol) in ethanol (4 mL) and 10% Palladium on Carbon was hydrogenated at 35 psi for 1.5 hours. The mixture was filtered and evaporated to give [3-(4-amino-phenyl)-2-hydroxy-propyl]-ethyl-carbamic acid tert-butyl ester as a yellow gum, 0.94 g (98%) MS(ES) (M+H)+=295.

Provenance & Evidence