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Indole derivativesIndole derivatives R 0140 New and Efficient One-Pot Synthesis of Functionalized γ-Spirolactones Mediated by Vinyltriphenylphosphonium Salts. -Isatin derivatives and dimethyl acetylenedicarboxylate react in the presence of triphenylphosphine to give novel γ-spirolactones (III). -(ESMAILI*, A. A.; BODAGHI, A.; Tetrahedron 59 (2003) 8, 1169-1171; Dep. Chem., Univ. Birjand, Birjand, Iran; Eng.) -Mais 25-137

The zwitterionic intermediate generated from dialkyl acetylenedicarboxylate and triphenylphosphine on reaction with Nsubstituted isatins leads to new highly functionalized spiro-2,5-dihydro-1,2-oxaphospholes.

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