反应详情

EXAMPLE 37A (11.5 g) in dichloromethane (40 mL) in a polypropylene bottle was treated with 70% hydrogen fluoride-pyridine (10.4 mL) dropwise at 0° C. The solution was allowed to warm to room temperature over 3 hours, and stirred for an additional 1.5 hours. The reaction mixture was diluted with ethyl acetate (200 mL) and poured into saturated aqueous NaHCO3. Additional solid NaHCO3 was used carefully until bubbling ceased. The organic layer was isolated, and the aqueous layer was extracted with additional ethyl acetate three times (150 mL each). The combined organic layers were washed with 5% HCl (50 mL each, twice), brine, dried over MgSO4, filtered and concentrated to give the desired product which was used directly in the next step.

1. customuntil bubbling
2. customThe organic layer was isolated
3. extractionthe aqueous layer was extracted with additional ethyl acetate three times (150 mL each)
4. washThe combined organic layers were washed with 5% HCl (50 mL each
5. dry with materialtwice), brine, dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated