Divergent enantioselective synthesis of (P)- and (M)-dihydro[5]helicenequinones from a common tetrahydroaromatic precursor

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Abstract
The domino asymmetric Diels–Alder reaction/spontaneous sulfoxide elimination process between a vinyl dihydrophenanthrene as diene and enantiopure (SS)-2-(p-tolylsulfinyl)-1,4-benzoquinone gave access to a tetrahydroaromatic pentacyclic derivative possessing central chirality which led, in a divergent way, to helically chiral (P) or (M) enantiomers of dihydro[5]helicenequinones in good to excellent chemical and optical yields simply by selecting the appropriate oxidant reagent which makes the final aromatization.

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