Boron trifluoride → 3-Benzyl-6-nitro-3-azabicyclo[3.1.0]hexane

Participants

Reaction Steps

To a solution of 3-benzyl-6-nitro-3-azabicyclo[3.1.0]hexane-2,4-dione (3.0 g, 12.2 mmol) in dry THF (30 ml) was added NaBH4 (1.15 g, 30.48 mmol). The reaction was stirred for 15 min at r.t. under N2. BF3.THF complex (3.15 ml, 13.4 mmol) was added dropwise and the reaction heated at 40° C. for 4 h. Further NaBH4 (0.15 g) was added followed by BF3.THF complex (0.32 ml). Heating was continued at 45° C. for 30 min. A mixture of THF/H2O (1/1, 60 ml) was added dropwise with stirring. The resulting mixture was heated at 50° C. for 1 h before standing at r.t. for 16 h. The THF was removed to leave mainly water. This was extracted with EtOAc, dried (MgSO4) and evaporated to dryness to give the title compound as a yellow oil (2.47 g, 93%). m/z 219 [M+H]+, 1H NMR (300 MHz, CDCl3) δ: 2.50 (4H, s), 3.15 (2H, d), 3.65 (1H, s), 4.55 (1H, s), 7.2-7.4 (5H, m).

Provenance & Evidence