Novel route for the construction of chromans from benzylic and aliphatic alcohols in the presence of NaHSO 4 /SiO 2 has been developed. In this reaction, substituted olefins are formed from benzylic and aliphatic alcohols and then converted to chromans through intramolecular cyclization. Twenty novel chromans were synthesized by this simple procedure.
Hydroxylation of the propelladienone (I) followed by protection with 2,2‐dimethoxypropane (II) yields the isomeric isopropylidene derivatives (III) and (IV).
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