Regiopspecific cyclization of the acetal (4g), derived in 5 steps from 2′-benzyloxyacetophenone (3a), gave the pyrone (6a), which was easily converted into 2-methyl-5H-pyrano[3,2-c][1]benzopyran-4-one (1b), the basic skeleton in citromycetin (1a).
T. Watanabe, S. Katayama, Y. Nakashita and M. Yamauchi, J. Chem. Soc., Chem. Commun., 1981, 761 DOI: 10.1039/C39810000761
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