反应详情

To a suspension of CuI (19.3 g, 107 mmol) in dry THF (2000 mL) under N2 atmosphere was added methyl magnesium bromide (3 M in diethyl ether, 537 mL, 1.61 mol) at −70° C. After being stirred at this temperature for 1 hour, a solution of (3aR,5S,6aR)-2,2-dimethyl-5-[(2R)-oxiran-2-yl]-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxole (compound 6b, 100 g, 537 mmol, dissolved in anhydrous THF 200 mL) was added to reaction mixture dropwise. After being stirred at −70° C. for additional 2 hours, the reaction mixture was poured into saturated NH4Cl solution. The organic layer was separated and the aqueous phase was extracted with EtOAc twice. The combined organic layers were dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography on silica gel (eluting with 1:3 EtOAc in petroleum ether) to afford 82 g of (1R)-1-[(3aR,5S,6aR)-2,2-dimethyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl]propan-1-ol (compound 6c) as a slight yellow solid.

1. stirringAfter being stirred at −70° C. for additional 2 hours
2. customThe organic layer was separated
3. extractionthe aqueous phase was extracted with EtOAc twice
4. dry with materialThe combined organic layers were dried over Na2SO4
5. concentrationconcentrated in vacuo
6. customThe residue was purified by column chromatography on silica gel (eluting with 1:3 EtOAc in petroleum ether)