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The stereoselective synthesis of the C1-C7 fragment (3R,4S,6R)-3,4-di[(tert-butyl- dimethylsilyl)oxy]-7-hydroxy-6-methylheptan-2-one, which is the crucial intermediate for synthesis of the HIV-1 protease inhibitive didemnaketals, was developed via 12 steps from the natural (+)-pulegone.