反应详情

A solution of ethyl 2-methyl-4-bromobenzoylacetate (18.5 g, 65.0 mmol) was heated at 60° C. with 9-hydroxyxanthene (14.2 g, 71.5 mmol) in ethanol-acetic acid (1:1, 200 ml) for 40 h. The product was isolated as in Example 1 (iii), except the aqueous phase was extracted with diethyl ether. The crude product was purified on flash silica eluting with hexane-dichloromethane (3:2 then 1:1) to give ethyl 2-(4-bromo-2-methylbenzoyl)-2-(9H-xanthen-9-yl)acetate as an oil.

1. extractionwas extracted with diethyl ether
2. customThe crude product was purified on flash silica eluting with hexane-dichloromethane (3:2