Water → 7-Iodo-3,4-dihydro-1H-benzo[b]azepine-2,5-dione

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 7-iodo-2,5-dioxo-2,3,4,5-tetrahydro-1H-benzo[b]azepine-4-carboxylate (iii-a) (4.84 g, 13.2 mmol) in dimethyl sulfoxide (66 mL) was added a solution of NaCl (81 mg, 15.9 mmol) in H2O (475 μL, 26.4 mmol). The reaction mixture was heated to 150° C. for 2 h, and subsequently cooled to 0° C. for 30 min. H2O (120 mL) was added and the solution was allowed to stir for an additional 1.5 h at 0° C. The resulting precipitate was filtered to provide iv-a (3.2 g, 81%) as a purple/brown solid: MS m/z═302 (M+H).

Provenance & Evidence