Potassium Carbonate → Thieno[2,3-b][1,5]benzoxazepin-4(5H)-one

Participants

Reaction Conditions

Reaction Steps

To a solution of N-(2-hydroxyphenyl)-2-bromo-3-thiophenecarboxamide (16 g) in dimethyl sulfoxide (160 ml) was added potassium carbonate (15 g) and the mixture was stirred at 150-160° C. for 25 minutes. The reaction system was cooled to room temperature and the reaction mixture was poured into water-ethyl acetate. The precipitated crystals were collected by filtration and washed with water and diisopropyl ether to give thieno[2,3-b][1,5]benzoxazepin-4(5H)-one (5.3 g).

Provenance & Evidence