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ChemInform Abstract: One-Pot Synthesis of New Spiro[cyclopropane-1,3′-[3H]indol]-2′(1′H)-ones from 3-Phenacylideneoxindoles.

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Abstract

Hydrazine addition to α,β-enones (I) affords a spiroindolepyrazolone as intermediate which is not separated but reacted in situ with lead tetraacetate (II) to form a mixture of diastereoisomeric spirocyclopropaneindolones (III) and (IV).

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