Boron tribromide → 1-(4-Hydroxybenzyl)imidazole

Participants

Reaction Steps

To a stirred solution of the compound of Step A (16.3 g, 86.1 mmole) in methylene chloride (860 ml) cooled to 5° C., was added boron tribromide (32.6 ml, 344.4 mmole) dropwise over 15 minutes. After 2 hours at 5° C., the reaction was quenched with methanol dropwise, evaporated to dryness, and redissolved in methanol, water, and methylene chloride. The pH was adjusted to 8.4 with sodium hydroxide. The organic layer was dried over sod4um sulfate and evaporated to dryness to give N-p-hydroxybenzylimidazole (13.6 g, 91%) which was used without further purification:

Provenance & Evidence