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To a suspension of NaH (17.6 g, 60%) in DMF (150 mL) at ice-bath temperature with mechanical stirring was added over a one hour period a mixture of 4-chlorobenzyl cyanide (30.3 g) and 1,3-dibromopropane (22.3 mL, 44.5 g). The reaction mixture was stirred for...
Morpholine (1.1 mL, 0.012 mol) was added to a solution of ethyl 4-(6-acetoxy-3-oxo-2H-benzo[b][1,4]oxazin-4(3H)-yl)butanoate in 10 mL THF and the resulting mixture was refluxed for 1 h. The progress of the reaction was monitored by thin layer chromatography...
To a mixture of 4-(6-acetyl-3-oxo-2H-benzo[b][1,4]oxazin-4(3H)-yl)butanoate (1.3 g, 0.003 mol), urea hydrogen peroxide (0.85 g, 0.009 mol) and sodium bicarbonate (0.76 g, 0.009 mol) in anhydrousdichloromethane (10 mL) under nitrogen atmosphere at ice-bath temperature...

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To a suspension of NaH (17.6 g, 60%) in DMF (150 mL) at ice-bath temperature with mechanical stirring was added over a one hour period a mixture of 4-chlorobenzyl cyanide (30.3 g) and 1,3-dibromopropane (22.3 mL, 44.5 g). The reaction mixture was stirred for...
Morpholine (1.1 mL, 0.012 mol) was added to a solution of ethyl 4-(6-acetoxy-3-oxo-2H-benzo[b][1,4]oxazin-4(3H)-yl)butanoate in 10 mL THF and the resulting mixture was refluxed for 1 h. The progress of the reaction was monitored by thin layer chromatography...
To a mixture of 4-(6-acetyl-3-oxo-2H-benzo[b][1,4]oxazin-4(3H)-yl)butanoate (1.3 g, 0.003 mol), urea hydrogen peroxide (0.85 g, 0.009 mol) and sodium bicarbonate (0.76 g, 0.009 mol) in anhydrousdichloromethane (10 mL) under nitrogen atmosphere at ice-bath temperature...