Boron tribromide → HCID 136337204, compound

Participants

Reaction Steps

To a cooled (0° C.) solution of the title compound from Example 2 Step A (2.89 g, 7.06 mmol) in DCM (30 mL) was added dropwise BBr3 (21.2 mL, 1.0 M in DCM, 21.2 mmol). After addition was complete, the cooling bath was removed, and the reaction mixture was allowed to stir at room temperature. After 1.5 h, the mixture was cooled to 0° C., then was quenched by careful addition (exothermic, gas evolution) of sat aq NaHCO3 (100 mL). The resulting mixture was diluted with DCM, the phases were separated, and the organic phase was concentrated in vacuo. Purification by chromatography on silica gel (0 to 35% EtOAc in hexanes, then 35 to 100% EtOAc in hexanes) provided the title compound: LCMS m/z 395.8 [M+H]+; 1H NMR (500 MHz, CDCl3) δ 11.79 (s, 1H), 8.18 (s, 1H), 8.10 (t, J=8.0 Hz, 1H), 7.95 (d, J=8.0 Hz, 1H), 7.54 (d, J=8.0 Hz, 1H), 7.49 (dd, J=10.0, 3.0 Hz, 1H), 7.09-7.06 (m, 1H), 6.98 (dd, J=9.0, 5.0 Hz, 1H), 4.39 (q, J=7.0 Hz, 2H), 1.39 (t, J=7.0 Hz, 3H).

Provenance & Evidence