反应详情

A mixture of 1 g of the product of Example 2, 25 ml of ether and 1 g of dry lithium chloride was stirred under a current of gaseous hydrogen chloride at -30° C. for 2 hours and then at 0° C. for 2 hours after which the current of gaseous hydrogen chloride was stopped. The mixture was stirred at room temperature for 48 hours and after 54 hours of contact, the mixture was poured into iced water. The mixture was extracted with benzene and the organic phase was dried and evaporated to dryness under reduced pressure. The 1.1 g of residue was chromatographed over silica gel and was eluted with a 1-1 benzene-ethyl acetate mixture to obtain 545 mg of dl trans 4-(2-chloro-prop-2-yl)-5-hydroxy-tetrahydrofuran-2-one in the form of crystals melting at 80° C.

1. extractionThe mixture was extracted with benzene
2. customthe organic phase was dried
3. customevaporated to dryness under reduced pressure
4. customThe 1.1 g of residue was chromatographed over silica gel
5. washwas eluted with a 1-1 benzene-ethyl acetate mixture