This paper describes SeO2-mediated one-pot tandem cyclocondensation of 1,3-bis-sulfonylacetones and o-dimethylarenes via (4+3) annulation to construct diversified bis-sulfonyl benzotropones. Under mild conditions, the effective reaction forms two carbon-carbon double (C=C) bonds in a single-step process in the formation of a seven-membered ring system. A plausible mechanism is proposed and discussed herein.
M. Chang and C. Ho, Org. Biomol. Chem., 2025, Accepted Manuscript , DOI: 10.1039/D5OB01123J
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