We have developed a versatile synthetic method for the construction of spirocyclic guanidines in moderate yields by intramolecular dearomative oxidative cyclization of guanidino phenols using the hypervalent iodine reagent 4‐chloro‐1‐(diacetoxyiodo)benzene in 2,2,3,3‐tetrafluoro‐1‐propanol.
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