反应详情

To a suspension of 5.0 g of product from Example 23, 0.055 g of dimethylformamide and 70 ml of methylene chloride is added 1.96 ml of oxalyl chloride. The reaction is stirred at room temperature for 22 hours and concentrated. The residue is dissolved in diethyl ether, filtered and concentrated to give 5.28 g of the desired product as cream crystals.

1. concentrationconcentrated
2. dissolutionThe residue is dissolved in diethyl ether
3. filtrationfiltered
4. concentrationconcentrated