反应详情

Into a 50-mL round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed a solution of 3-(2-(2-(2-(1,3-dioxoisoindolin-2-yl)ethoxy)ethoxy)ethoxy)propanoic acid (700 mg, 1.99 mmol, 1.00 equiv) in anhydrous DCM (30.0 mL), then oxalyl dichloride (0.7 mL) was added dropwise at room temperature. Two drops of anhydrous DMF were then added. The resulting solution was heated to reflux for 40 min. The solvent was removed under vacuum to yield 750 mg of 3-(2-(2-(2-(1,3-dioxoisoindolin-2-yl)ethoxy)ethoxy)ethoxy)propanoyl chloride as pale yellow oil, which was used directly for the next reaction step without further purification.

1. customInto a 50-mL round-bottom flask purged
2. temperaturemaintained with an inert atmosphere of nitrogen
3. temperatureThe resulting solution was heated
4. temperatureto reflux for 40 min
5. customThe solvent was removed under vacuum