反应详情

70.3 g (0.36 mol) of the compound from Example XXXVII are stirred under reflux in 0.5 l of acetic anhydride for 1.5 hours. The mixture is concentrated to dryness, the residue is dissolved in methylene chloride and the title compound is crystallised out by addition of petroleum ether.

1. concentrationThe mixture is concentrated to dryness
2. dissolutionthe residue is dissolved in methylene chloride
3. customthe title compound is crystallised out by addition of petroleum ether