反应详情

To a suspension of furo[2,3-b]pyridine-3-carboxaldehyde (67 mmol) [J. Heterocyclic Chem., 23, 1465 (1986)] in 52 mL H2O were added NaH2PO4 (67 mmol), 260 mL t-BuOH, 71 mL 2-methyl-2-butene followed by portionwise addition of NaClO2 (100 mmol) at 0° C. After 15 min, the cooling bath was removed and the reaction was stirred at RT for 24 h. A solution of sat. aq. NaHCO3 was added and the mixture was extracted with EtOAc. The water phase was acidified with 1N HCl solution and it was then extracted 3 times with EtOAc. The combined organic layers were dried over MgSO4 and concentrated in vacuo to obtain the desired compound as beige solid.

1. customthe cooling bath was removed
2. additionA solution of sat. aq. NaHCO3 was added
3. extractionthe mixture was extracted with EtOAc
4. extractionwas then extracted 3 times with EtOAc
5. dry with materialThe combined organic layers were dried over MgSO4
6. concentrationconcentrated in vacuo