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Published in last 50 years
11-Deoxyanthracyclinone precursors 6a and 6b have been prepared regiospecifically by the reaction of bromojuglone methyl ethers 4a and 4b with vinylketene acetal 5 , prepared from the Hagemann's ester ketal 7a .
A general method of annellating quinones in high yield has been devised using mixed vinylketene acetals obtained directly from the enolate ions of unsaturated esters.