A practical synthesis of d,l-dibenzocyclooctadiene lignans, d,l-deoxyschizandrin, d,l-wuweizisu C, and their stereoisomers.

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Several (±)-dibenzocyclooctadiene lignans, (±)-deoxyschizandrin (2a), (±)-wuweizisu C (2b), and their stereoisomers 3a, 3b, and 3b-TBC, were synthesized stereospecifically from corresponding phenylacetones 5a and 5b in four steps.