Cesium carbonate → 1-(8-Bromo-4,5-dihydrothiazolo[4,5-d]benzo[b]oxepin-2-yl)-5,5-dimethylimidazolidin-2,4-dione

Participants

Reaction Conditions

Reaction Steps

A mixture of 1.002 g (2.048 mmol) of 2-bromo-2-methyl-N-(8-bromo-4,5-dihydrothiazolo[4,5-d]benzo[b]oxepin-2-yl)carbamoylpropanamide and 1.660 g (5.11 mmol) of cesium carbonate in 100 ml of N,N-Dimethylformamide was stirred at 60° C. for 2 hours. The mixture was filtered, the filtrate concentrated in high vacuum, the residue partitioned between ethyl acetate and water. pH was adjusted to 5 by addition of 5% aq citric acid. The organic extracts were washed with water, brine, dried over MgSO4 and concentrated in vacuum to give 1-(8-Bromo-4,5-dihydrothiazolo[4,5-d]benzo[b]oxepin-2-yl)-5,5-dimethylimidazolidin-2,4-dione as an off-white powder which was used in the next steps without further purification. Yield 0.812 g (97%). MS (ESI+): 408.1

Provenance & Evidence