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Synthesis 2010(14): 2468-2474  
DOI: 10.1055/s-0029-1218768
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Hydroamination of 2-Ethynyl-4,5,6,7-tetrahydroindoles: Toward 2-Substituted Amino Derivatives of Indole

Lyubov’ N. Sobenina, Denis N. Tomilin, Ol’ga V. Petrova, Igor’ A. Ushakov, Al’bina I. Mikhaleva, Boris A. Trofimov*
A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky St., Irkutsk 664033, Russian Federation
Fax: +7(3952)419346; e-Mail: boris_trofimov@irioch.irk.ru;
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Publication History

Received 19 March 2010
Publication Date:
05 May 2010 (online)

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Abstract

Hydroamination of 1-phenyl-3-(4,5,6,7-tetrahydro-1H-indol-2-yl)prop-2-yn-1-ones with secondary dialkylamines proceeds under mild conditions (room temperature, aqueous ethanol, 1 h) to afford the corresponding (2E)-3-dialkylamino-3-(4,5,6,7-tetrahydro-1H-indol-2-yl)prop-2-en-1-ones in 72-92% stereoselectivity and 64-88% yield. Under the same conditions, ethyl 3-(4,5,6,7-tetrahydro-1H-indol-2-yl)prop-2-ynoates react with dimethylamine and diethylamine in different ways; dimethylamine converts the ester function into an amide, giving the corresponding N,N-dimethyl-3-(4,5,6,7-tetrahydro-1H-indol-2-yl)prop-2-ynamides in 70-86% yield, whereas diethylamine adds to the triple bond to give the corresponding ethyl 3-(diethylamino)-3-(4,5,6,7-tetrahydro-1H-indol-2-yl)prop-2-enoates with ∼100% stereoselectivity and up to 85% yield. The difference in the reactivity of the two amines can be rationalized in terms of steric hindrance.

Key words

indoles - alkynes - aminations - nucleophilic additions - amides

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