Triflic acid catalysed regioselective synthesis of substituted naphthalenes by benzannulation of carbonyls with alkynes
2021
Gudla, Vanajakshi | Sudheer, Mokhamatam | Rao, Chinthu Joginarayana | Sanasi, Paul Douglas | Battula, Venkateswara Rao
An interesting and facile triflic acid catalysed annulation of α-aryl carbonyls with arylalkynes is presented for the regioselective synthesis of substituted naphthalenes. The annulation reaction involves a sequence of electrophilic attack of carbonyl on arylalkyne and benzannulation catalysed by triflic acid. The present catalyst effects this transformation at room temperature itself. Intramolecular version of the present Brønsted acid catalysis furnished compounds containing 1-arylnaphthalene core fused with ring systems in excellent yields.
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