Water → HCID 22733874, compound

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, Compound 168 (0. 04 g) obtained in Example 168 was dissolved in dry dichloromethane (2 ml) and the solution was cooled to −78° C. A 2.4M solution (0.125 ml) of boron tribromide in dichloromethane was slowly and dropwise added to the solution, and then the mixture was warmed to the room temperature and stirred one night. Distilled water (5 ml) was added to the mixture followed by stirring for one hour. The reaction solution was extracted with chloroform, the organic layer was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography to give Compound 169 (0.02 g, 46.9%) as a pale-yellow solid.

Provenance & Evidence