Vinylcarbenoids are used as three-carbon components in Rh(III)-catalyzed C–H activation/[4 + 3] cycloaddition with benzamides to access azepinones. This transformation makes a feature of simple starting materials, mild reaction conditions and high efficiency. A kinetic isotope effect study was conducted and a plausible mechanism is proposed.
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Cui et al. (2013) studied this question.
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