Acetic Anhydride → 1-Acetyl-2,3,5,6-tetrahydro-1H-benzo[b][1,5]diazocin-4-one

Participants

Reaction Conditions

Reaction Steps

2,3,5,6-Tetrahydro-1H-benzo[b][1,5]diazocin-4-one (prepared as in J. Am. Chem. Soc. 2004, 126, 3529-3533) (1.00 g, 5.68 mmol) was dissolved in anh acetonitrile (50 ml). Acetic anhydride (587 μL, 6.25 mmol) was added and the reaction mixture was heated to 80° C. for 16 h. The reaction mixture was concentrated, triturated with ether, and filtered to afford title compound as a beige solid. (1.063 g, 86%) mp 236-239° C.; LCMS: m/z=219.30 (M+H+), HPLC (95% purity); 1H NMR (400 MHz, DMSO-d6) δ 7.82 (m, 1H), 7.38 (m, 4H), 4.64 (m, 1H), 4.29 (m, 1H), 3.87 (m, 1H), 2.92 (m, 1H), 2.57 (m, 1H), 2.26 (m, 1H), 1.69 (s, 3H).

Provenance & Evidence