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DOI: 10.1055/s-0029-1216901
A ‘Click’ Approach to the Synthesis of 3-[2-(1-Alkyltriazol-4-yl)ethyl]indoles
Publication History
Publication Date:
14 July 2009 (online)
Abstract
Copper-catalyzed cycloaddition of N-(tert-butoxycarbonyl)-3-(1-tosyl-3-butynyl)-1H-indole with various azides readily provides the corresponding (triazolylethyl)indoles. These derivatives can be regarded as indole-3-propionic acid mimics because of the electronic features of the triazole ring that are closely related to the amido group. The obtained (indolylethyl)triazoles can be further functionalized exploiting an elimination-addition reaction involving the tosyl group.
Key words
alkynes - cycloadditions - heterocycles - indoles - nucleophilic additions
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References
Thus, the presence of the first triazolyl group would provide a sort of activation for the formation of the second group, as evidenced by Finn and co-workers;¹7 however, this activation is not strong enough to provide complete formation of the bisadduct unless a large excess of alkyne is used.