A Facile Route to Pyrazolo1,2‐acinnoline via Rhodium(III)‐catalyzed Annulation of Pyrazolidinoes and Iodonium Ylides

Abstract 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 pyrazolo1,2‐acinnolines. Herein, iodonium ylide serves as a carbene precursor. This protocol exhibits good regioselectivity and high functional group tolerability under mild reaction conditions.