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0 °C

Under a N2 atmosphere, to a solution of 2-(6-hydroxyhexahydrofuro[3,2-b]furan-3-yl)isoindoline-1,3-dione (2.35 g, 8.54 mmol) in dichloromethane (40 mL) were added triethylamine (1.30 g, 12.8 mmol) and N,N-dimethylpyridin-4-amine (209.2 mg, 1.7 mmol) and the mixture was cooled to 0° C. and then methanesulfonyl chloride (0.8 mL, 10.0 mmol) was added to the mixture. The resulting mixture was stirred at 0° C. for 30 min, then moved to room temperature overnight. The mixture was diluted with dichloromethane (100 mL), washed with 1M HCl (100 mL), water (100 mL) and brine (100 mL). The separated organic phase was dried over anhydrous Na2SO4, and then concentrated in vacuo. The residue was purified by silica gel column chromatography (MeOH/DCM (v/v)=1/200) to give the title compound as a white solid (2.35 g, 77.9%).

1. waitmoved to room temperature overnight
2. washwashed with 1M HCl (100 mL), water (100 mL) and brine (100 mL)
3. dry with materialThe separated organic phase was dried over anhydrous Na2SO4
4. concentrationconcentrated in vacuo
5. customThe residue was purified by silica gel column chromatography (MeOH/DCM (v/v)=1/200)