Anthracyclines. XIII. The synthesis of (+)-(4R,6R)- and (+)-(4S,6R)-6-acetyl-6-(t-butyldimethylsilyloxy)-4-ethoxy-4-methoxy-5,6,7,8- tetrahydronaphthalen-1(4H)-one: New chiral AB synthons for the synthesis of (-)-7-deoxydaunomycinone

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