Abstract
A green protocol (compared to the existing methodology) for carrying out Garratt–Braverman cyclization has been developed. The method involves stirring a pre-absorbed bispropargyl sulfone/ether/sulfonamide over basic alumina. The reaction with sulfones was over within 10–15min at room temperature whereas for the ether/sulfonamide the reaction took 6–8h at 130°C. The products, aryl naphthalene derivatives, are obtained by simple filtration through Celite, in excellent yields.
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