Methyl Ethyl Ketone → Ethyl[(6,7-dichloro-2-hydroxymethylbenzo[b]thien-5-yl)oxy]acetate

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Reaction Steps

A solution of 1.24 g of 6,7-dichloro-5-hydroxy-2-hydroxymethylbenzo[b]thiophene, 0.9 g of ethyl bromoacetate, 0.6 g of potassium carbonate, 25 ml of 2-butanone and 0.5 ml of dimethylformamide is stirred under reflux for 2 hrs. The aqueous layer is extracted twice with 50 ml portions of dichloromethane. The combined organic extracts, are washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated to give a clear oil which crystallizes on standing. Recrystallization of the crude product from acetone-hexane gives 1.8 g of ethyl[(6,7-dichloro-2-hydroxymethylbenzo[b]thien-5-yl)oxy]acetate mp 117°-118.5°.

Provenance & Evidence