Boron trifluoride etherate → HCID 22983874, compound

Participants

Reaction Conditions

Reaction Steps

To neat BF3-Et2O (126 μL, 141 mg, 1.00 mmol) at −15° C. under Ar (g) was added a solution of compound 95 (228 mg, 0.66 mmol) in dry CH2Cl2 (4 mL) followed by the dropwise addition t-butyl nitrite (95 μL, 82 mg, 0.80 mmol). This solution was stirred at −15° C. for 10 min then at 0° C. for 1.5 h. Pentane (16 mL) was added to the cold solution and a red gummy solid precipitated. The solvent was decanted and the residue was rinced with cold Et2O (5 mL). The residue was dried under vacuum to give a foamy orange-red solid. This solid was heated under vacuum with a heatgum for 5 min. The residue was purified by flash chromatography (SiO2) using 3:7 to 1:1 EtOAc/Hexanes as eluent to give compound 96 (32 mg, 14%) as a solid. 1H NMR (CDCl3) δ 0.90 (3H, s), 1.25-1.64 (m, 6H), 1.92-2.29 (6H, m), 2.50 (1H, dd, J=18.9 Hz, 8.9 Hz), 2.82 (2H, dd, J=8.4 Hz, J′=3.5 Hz), 3.45 (3H, s), 3.75 (2H, t, J=4.7 Hz), 4.15 (2H, t, J=4.5 Hz), 6.71 (1H, d, J=8.7 Hz), 6.98 (1H, d, J=13.2 Hz); 13C NMR(CDCl3) δ 13.8, 21.5, 25.9, 26.5, 29.0, 29.7, 31.5, 35.8, 38.0, 43.9, 47.9, 50.3, 59.2, 69.2, 71.0, 113.1 (d, J=18.7 Hz), 116.1, 132.6 (d, J=87.0 Hz), 144.5, 149.5, 152.7, 220.6.

Provenance & Evidence