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Aromatization of 1,6,7,7a-Tetrahydro-2H-indol-2-ones by a Novel Process. Preparation of Key-Intermediate Methyl 1-Benzyl-5-methoxy-1H-indole-3-acetate and the Syntheses of Serotonin, Melatonin, and Bufotenin

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Laboratoire de Chimie Organique, CNRS (ESA 7084), ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05, France, and URCOM, Université du Havre, Faculté des Sciences et Techniques, 25 rue Philippe Lebon BP 540, 76058 Le Havre Cedex, France
Cite this: J. Org. Chem. 2002, 67, 7, 2252–2256
Publication Date (Web):March 7, 2002
https://doi.org/10.1021/jo0110597
Copyright © 2002 American Chemical Society
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Abstract

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Imine 7 of 1,4-cyclohexanedione mono-ethylene ketal 6 was reacted with maleic anhydride, affording the cyclized adduct 8. Methyl esterification of 8, accompanied by transacetalization, led to the dihydrooxindole derivative 10. Aromatization of 10 was then accomplished with POCl3, leading directly to the key-intermediate title compound 11 in 74% yield from ketone 6. Serotonin, melatonin, and bufotenin were then obtained by standard reactions.

 Laboratoire de Chimie Organique, CNRS (ESA 7084).

 URCOM, Université du Havre.

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1H and 13C NMR spectra of compounds 1, 2, 3, 7, 8, 9, 10, 10a, 10b, 11, 12, 13, 14, 15, 16, 17; 1H spectra of the dipicrate of 3, picrate of 17. This material is available free of charge via the Internet at http://pubs.acs.org.

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