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ethyl 6-bromo-4-[1-(methoxycarbonyl)cyclobutyl]-2-oxochroman-3-carboxylate[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
68%
With mercury dichloride; zinc; In N,N,N,N,N,N-hexamethylphosphoric triamide; benzene; for 4h;Reflux;
A mixture of 3 g of fine zinc chips, a catalytic amount of mercurybichloride, 20 ml of anhydrous benzene, 1 ml of HMPT, 12 mmol (2.32 g) of compound I, and 10 mmol (2.97 g) ofcompound II was boiled for 4 h, cooled, poured from zinc excess, hydrolyzed with 5% acetic acid; the organic layer wasseparated; reaction products were twice extracted with ethyl acetate from the water layer. After the extract was dried withanhydrous sodium sulfate the solvents were removed, and compound III was recrystallized from ethanol.