SYNTHESIS OF IMIDAZO[1,2-<i>a</i>]INDOLES FROM 2-CHLOROINDOLE-3-CARBALDEHYDE
DOI:
https://doi.org/10.1007/3152Keywords:
2-bromo-1, 1-diethoxyethane, 2-chloroindole-3-carbaldehyde, imidazo[1, 2-a]indoles, indoles, , cyclizationAbstract
A two-step approach towards the synthesis of imidazo[1,2-a]indoles from 2-chloroindole-3-carbaldehyde has been developed. It comprises the N-alkylation of indole ring by 2-bromo-1,1-diethoxyethane followed by a treatment with aromatic amine hydrochlorides. The reaction proceeds as a nucleophilic substitution of the chlorine atom at position 2 of the indole ring followed by cyclization along with the condensation at the aldehyde group. Imidazo[1,2-a]indoles were isolated as protonated Schiff bases. Their structure was proved by 1H and 13C NMR spectroscopy and X-ray structural analysis.Downloads
Published
2016-06-03
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Section
Original Papers