反应详情

Oxalyl chloride (5.86 ml) was added by portions to a solution of 2-methyl-1,3-dioxo-5-isoindolinecarboxylic acid (9.2 g) obtained in Reference Example 229 and dimethylformamide (catalytic amount) in tetrahydrofuran (100 ml) at room temperature. After stirred at room temperature for 1 hour, the solvent was evaporated under reduced pressure. The resulting residue was filtered, washed with diethyl ether and dried under reduced pressure to give the title compound as a white solid.

1. customthe solvent was evaporated under reduced pressure
2. filtrationThe resulting residue was filtered
3. washwashed with diethyl ether
4. customdried under reduced pressure