反应详情

2K (1.33 g, 11.2 mmol), N-hydroxyphthalimide (2.02 g, 12.4 mmol), triphenylphosphine (3.25 g, 12.4 mmol) were dissolved in 30 mL of dry THF and the mixture was cooled in an ice bath. Diisopropyl azodicarboxylate (2.51 g, 12.4 mmol) in 5 mL of THF was added to the above mixture dropwise. After the addition was complete, the ice bath was removed and the reaction was stirred at room temp overnight. Next day, the reaction was done. It was concentrated in vacuo to an oil and then purified on flash column chromatography using ethyl acetate/hexane 20/80 to give (R)-2-((1,4-dioxan-2-yl)methoxy)isoindoline-1,3-dione (2L). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 3.56 (t, J=10.74 Hz, 1H) 3.60-3.85 (m, 4H) 3.92 (dd, J=11.75, 2.40 Hz, 1H) 4.05 (ddd, J=9.98, 3.03, 2.91 Hz, 1H) 4.11-4.19 (m, 1H) 4.20-4.29 (m, 1H) 7.71-7.80 (m, 2H) 7.81-7.91 (m, 2H).

1. temperaturethe mixture was cooled in an ice bath
2. additionAfter the addition
3. customthe ice bath was removed
4. concentrationIt was concentrated in vacuo to an oil
5. custompurified on flash column chromatography