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Note | Regular issue | Vol 65, No. 8, 2005, pp.1989-1997
Published online, 1st July, 2005
DOI: 10.3987/COM-05-10457
Tautomerization of 3a,7a-Dihydroindole-2,3,3a,4-tetracarboxylate

Kyu Ok Jeon, Ji Sook Yu, and Chang Kiu Lee*

*Department of Chemistry, Kangwon National University, Chuncheon, Kangwon 200-701, Korea


Tetramethyl 3a,7a-dihydroindole-2,3,3a,4-tetracarboxylate which is a 1:2 adduct of pyrrole with dimethyl acetylenedicarboxylate dissolved in various solvents underwent tautomerization to 3a,7a-dihydroindolenine esters. Acid or base externally added to the pure solvents promotes the isomerization.