Sodium Azide → 2-[4-(Diphenylmethoxy)phenyl]-1-cyclohexyl-5-(1H-tetrazol-5-yl)-1H-benzimidazole

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Reaction Steps

Aluminum trichloride (33 mg, 0.247 mmol) was added to ice cold THF (4 mL). Sodium azide (48 mg, 0.744 mmol) was added and the resulting mixture was stirred under reflux for 30 min to complete the formation of the aluminum azide. Compound 8 (100 mg, 0.206 mmol) was added and the mixture stirred under reflux for 18 h. The reaction mixture was poured into ice cold dilute HCl to precipitate a solid. The solid was dissolved in DMF (2 mL) and the solution applied to a Shimadzu Prep HPLC. The product containing fractions were combined. Removal of the methanol resulted in the precipitation of 9 as a colorless solid (22.3 mg, 20.6% yield). ESI-MS m/e 527 (M=1). 1H NMR (DMSO) δ 8.33 (s, 1H), 8.20 (d, 1H, J=8.6 Hz), 8.0 (1H, d, J=7.41 Hz), 7.63 (d, 2H, J=8.7 Hz), 7.55 (d, 4H, J=7.2 Hz), 7.41-7.37 (m, 4H), 7.34-7.26 (m, 4). 6.72 (s, 1H), 4.34-4.27 (m, 1H), 2.36-2.23 (m, 2H), 1.97-1.83 (m, 4H), 1.66-1.62 (m, 1H), 1.43-1.21 (m. 3H).

Provenance & Evidence