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An efficient and facile method for producing 2,3-dihydronaphtho[2,3- b ]furan and 3,4-dihydro-2 H -benzo[ g ]chromene has been developed. This methodology utilizes an inexpensive and simple PTSA catalyst for the cyclization reaction of  ortho -oxalate-,  ortho -keto-, and  ortho -formyl arylacetylenols to produce the corresponding products in high yield. This procedure was also successfully applied to the large-scale synthesis of the naphthofuran skeleton, which can be found in various natural products and pharmaceuticals.

Acid-catalyzed synthesis of 2,3-dihydronaphtho[2,3- b ]furan and 3,4-dihydro-2 H -benzo[ g ]chromene derivatives