反应详情

To a 100 ml CH3CN solution of ethyl 7-(3-hydroxypropoxy)-2-ethylchromane-2-carboxylate (2.88 g, 9.4 mmol) was added triphenylphosphine (3.21 g, 12.2 mmol) and carbon tetrabromide (4.05 g, 12.2 mmol) upon cooling in an ice-water bath. After stirring at rt for 1 hr, the solvent was removed under reduced pressure. The residue was suspended in dichloromethane and was charged onto a silica gel column. Elution with 10% AcOEt/hexanes gave the title compound 3.36 g (96%).

1. temperatureupon cooling in an ice-water bath
2. customthe solvent was removed under reduced pressure
3. additionwas charged onto a silica gel column
4. washElution with 10% AcOEt/hexanes