RhI in two minds: A RhI-catalyzed tandem heterocyclization/[3+2] cycloaddition reaction was developed that provides rapid, efficient, and stereoselective access to highly substituted cyclopenta[c]furans from readily available 2-(1-alkynyl)-2-alken-1-ones and alkynes (see scheme). The cationic RhI acts as both a Lewis acid and a conventional transition-metal catalyst, providing the first example of a RhI species acting as a Lewis acid.
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Gao et al. (2012) studied this question.
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