Acetic Anhydride → N-(11-Oxo-10,11-dihydro-5H-dibenzo[b,e][1,4]diazepin-2-yl)-acetamide

Participants

Reaction Steps

A solution of 2-amino-5,10-dihydro-dibenzo[b,e][1,4]diazepin-11-one (Example 6, 200 mg, 0.89 mmol) and triethylamine in tetrahydrofuran (10 mL) was cooled to 0° C. (ice-water bath). To this was added acetic anhydride (90.6 mg, 0.89 mmol) dropwise over a period of 10 minutes. The mixture was allowed to warm to room temperature and stirred overnight. The mixture was concentrated at reduced pressure and the residue was chromatographed on silica gel (80% ethyl acetate/20% hexanes then 100% ethyl acetate and finally 2% methanol/ethyl acetate) to give a yellow solid (120 mg, 50.4%). H1 NMR (DMSO d6) δ: 9.82 (s, 1H), 9.80 (s, 1H), 7.82-7.81 (d, 1H, J=4.0), 7.68 (s, 1H), 7.58-7.55 (m, 11H), 6.95-6.86 (m, 5H), 1.97 (s, 3H).

Provenance & Evidence