Water → HCID 135976149, compound

Participants

Reaction Steps

1-(7-Carboxyheptyl)-2-(4-methoxyphenyl)-4,5-diphenyl-imidazole (2.5 g) was added, in portions over 40 minutes, to a solution of boron tribromide (2.17 ml) in anhydrous dichloromethane (40 ml). The reaction was stirred at room temperature for 5 h, cooled and water (50 ml) was carefully added. The organic layer was removed and the aqueous layer was washed with dichloromethane (3×75 ml). The organic extracts were combined, dried over anhydrous magnesium sulphate and evaporated to dryness in vacuo. Column chromatography on silica gel eluted with a dichloro-methane:methanol gradient and recrystallisation from ethanol/water and acetonitrile gave 1-(7-carboxy-heptyl)-2-(4-hydroxyphenyl)-4,5-diphenyl-imidazole (0.49 g, 20%) as a white solid, m.p. 171°-172°. Further material was obtained from the mother liquors (0.79 g, 33%) m.p. 167°. Found C: 76.85; H, 6.65; N, 6.20%; C29H30N2O3 requires: C, 76.63; H, 6.65; N, 6.16%;

Provenance & Evidence