Potassium tert-butoxide → 7-Chloro-3,5-dihydrobenzo[e][1,4]oxazepin-2(1H)-one

Participants

Reaction Steps

To a suspension of 2-bromo-N-(4-chloro-2-(hydroxymethyl)phenyl)acetamide (3.60 g, 12.9 mmol) in 2-propanol (129 ml) was added in small portions potassium tert-butoxide (3.77 g, 33.6 mmol) at 0-5° C. The reaction mixture was stirred for 90 minutes and then poured on ice/water (500 ml). The precipitate was collected by filtration and washed with water. Residual water was removed by evaporation of two 50 ml-portions of toluene to give the title compound (2.34 g, 92%) as light yellow solid. MS m/e: 196 ([M−H]−).

Provenance & Evidence