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A cascade annulation of 2-sulfonamido-N-phenylpropiolamide derivatives leading to the construction of the 2-spiropseudoindoxyl skeleton was realized under mild conditions with phenyliodine(III) bis(trifluoroacetate) (PIFA) as the sole oxidant. This metal-free spirocyclization process is suggested to encompass a sequential C(sp2)-C(sp) and C(sp2)-N bond formation with the concomitant introduction of a carbonyl oxygen.
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Reference：
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem