We have developed a Ti(IV)/Et3N-promoted trimolecular condensation of aromatic heterocycles (furan, pyrrole, imidazole, indole) with aldehydes and active methylene compounds. In the case of indole and methyl acetoacetate the reaction afforded three-component products or tricyclic cyclopenta[b]indole derivative, depending on the reaction conditions. In both cases, NMR analysis evidenced that titanium enolate is the reactive species involved in the reaction.
Multicomponent reactions studies: Yonemitsu-type trimolecular condensationspromoted by Ti(IV) derivatives
FONTANA, Antonella;DE MARIA, Paolo;
2010-01-01
Abstract
We have developed a Ti(IV)/Et3N-promoted trimolecular condensation of aromatic heterocycles (furan, pyrrole, imidazole, indole) with aldehydes and active methylene compounds. In the case of indole and methyl acetoacetate the reaction afforded three-component products or tricyclic cyclopenta[b]indole derivative, depending on the reaction conditions. In both cases, NMR analysis evidenced that titanium enolate is the reactive species involved in the reaction.File in questo prodotto:
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