Cyclizative Condensations. III. Indole and 1-Methylindole with Methyl Ketones

Wayland E. Noland, C. G. Richards, H. S. Desai, M. E. Venkiteswaran

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Condensation of indole with acetone in ethanolic hydrochloric acid gave five products, one of which was the easily autoxidizable monobase Ib. Acetylation and methylation of Ib was accompanied by loss of a molecule of hydrogen, giving the diacetyldehydro (IVa) and dimethyldehydro (IVb) derivatives. Condensation of 1-methylindole with acetone gave the same dimethyldehydro derivative (IVb), as well as the bisindole Va in larger yield, while condensation with mesityl oxide gave, depending upon the mole ratio, the 1:1 adduct VIb or the bisindole Va, along with 1-methylindole trimer. Reaction of indole with mesityl oxide gave the 1:1 adduct VIa. Heating of VIb at 140–150° gave a 2:1 condensation and rearrangement product (Vb or IX). Condensation of 1-methylindole with methyl isobutyl ketone gave a 2:2 product, probably XII or XIII, and a 1:2 product, possibly XIV or XV. Attempted cyclization of the 1:1 adduct of indole and methyl vinyl ketone gave two crystalline bimolecular condensation products, a neutral acyclic product (XVIII), and a basic cyclization product which is an indoline derivative, possibly XX.

Original languageEnglish (US)
Pages (from-to)4254-4262
Number of pages9
JournalJournal of Organic Chemistry
Volume26
Issue number11
DOIs
StatePublished - Nov 1961

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Ketones
Condensation
Cyclization
Acetone
Derivatives
Acetylation
Methylation
Hydrochloric Acid
indole
1-methylindole
Hydrogen
Crystalline materials
Heating
Molecules

Cite this

Noland, W. E., Richards, C. G., Desai, H. S., & Venkiteswaran, M. E. (1961). Cyclizative Condensations. III. Indole and 1-Methylindole with Methyl Ketones. Journal of Organic Chemistry, 26(11), 4254-4262. https://doi.org/10.1021/jo01069a019

Cyclizative Condensations. III. Indole and 1-Methylindole with Methyl Ketones. / Noland, Wayland E.; Richards, C. G.; Desai, H. S.; Venkiteswaran, M. E.

In: Journal of Organic Chemistry, Vol. 26, No. 11, 11.1961, p. 4254-4262.

Research output: Contribution to journalArticle

Noland, WE, Richards, CG, Desai, HS & Venkiteswaran, ME 1961, 'Cyclizative Condensations. III. Indole and 1-Methylindole with Methyl Ketones', Journal of Organic Chemistry, vol. 26, no. 11, pp. 4254-4262. https://doi.org/10.1021/jo01069a019
Noland, Wayland E. ; Richards, C. G. ; Desai, H. S. ; Venkiteswaran, M. E. / Cyclizative Condensations. III. Indole and 1-Methylindole with Methyl Ketones. In: Journal of Organic Chemistry. 1961 ; Vol. 26, No. 11. pp. 4254-4262.
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