反应详情

(S)-tert-butyl 1-cyano-2-(3′-methylbiphenyl-4-yl)ethylcarbamate (0.81 g, 2.408 mmol), sodium azide (0.344 g, 5.30 mmol) and zinc bromide (0.325 g, 1.445 mmol) were refluxed in i-propanol (15 mL) and H2O (30 mL) for 6 hours. The reaction mixture was cooled to room temperature, diluted with EtOAc, and washed with 1M HCl and brine. The organic layer was dried over Na2SO4 and concentrated under reduced pressure. The obtained residue was purified by silica gel flash column chromatography (EtOAc/heptane->10% MeOH in DCM/DCM) to give [(S)-2-(3′-methyl-biphenyl-4-yl)-1-(1H-tetrazol-5-yl)-ethyl]-carbamic acid tert-butyl ester. 1H NMR (400 MHz, DMSO-d6) δ 1.30 (s, 9H), 2.36 (s, 3H), 3.10-3.21 (m, 1H), 3.24-3.31 (m, 1H), 4.96-5.15 (m, 1H), 7.15 (d, J=7.33 Hz, 1H), 7.27-7.35 (m, 3H), 7.39-7.46 (m, 2H), 7.55 (d, J=8.08 Hz, 2H), 7.65 (d, J=8.34 Hz, 1H); MS: m/z (MH+) 380; Retention time=1.51 min. (condition A)

1. washwashed with 1M HCl and brine
2. dry with materialThe organic layer was dried over Na2SO4
3. concentrationconcentrated under reduced pressure
4. customThe obtained residue was purified by silica gel flash column chromatography (EtOAc/heptane->10% MeOH in DCM/DCM)