A rhodium(III)‐catalysed cascade C−H bond activation/intramolecular cyclization of pyrazolidiones with iodonium ylide has been described, leading to the formation of various pyrazolo[1,2‐a]cinnolines. Herein, iodonium ylide serves as a carbene precursor. This protocol exhibits good regioselectivity and high functional group tolerability under mild reaction conditions.
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Yang et al. (2021) studied this question.
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