Cyanogen Bromide → HCID 178508161, compound

Participants

Reaction Steps

A solution of 3-(3,4-diaminophenyl)-3-hydroxy-2-(phenylmethyl)-2,3-dihydro-1H-isoindol-1-one (613 mg, 1.77 mmol) and cyanogen bromide (188 mg, 1.77 mmol) in anhydrous ethanol (10 mL) was heated to 60° C. for 16 h. The reaction mixture was cooled and partitioned between ethyl acetate (200 mL) and saturated aqueous sodium bicarbonate. The organic layer was washed with water and brine then dried over anhydrous magnesium sulfate, filtered and the filtrate concentrated in vacuo. The residue was purified by reverse phase HPLC. To the combined fractions were added 6N aqueous hydrochloric acid (10 mL) and heated for 10 mins, at which time saturated aqueous sodium bicarbonate was added until pH reached 7. To the aqueous layer was added ethyl acetate (300 mL) and then separated. The organic layer was washed with brine and dried over magnesium sulfate, filtered and the filtrate concentrated in vacuo to afford 3-(2-amino-1H-benzimidazol-5-yl)-3-hydroxy-2-(phenylmethyl)-2,3-dihydro-1H-isoindol-1-one (10.3 mg). 1H NMR (400 MHz, d6-DMSO): 7.76 (d, 1H), 7.59-7.52 (m, 2H), 7.26-7.18 (m, 3H), 7.12-7.09 (m, 5H), 7.03-7.01 (m, 1H), 4.43 (d, 1H), 4.21 (d, 1H), 3.48-3.39 (m, 1H); MS (EI) for C22H18N4O2: 371 (MH+).

Provenance & Evidence