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Intramolecular 1,3-dipolar cycloadditions of dihydroimidazolium ylides: synthesis of pyrrolo[1,2,3-de] quinoxalines and imidazo[1,2-a]indoles

Record type: Article

N-Alkylation of 4,5-dihydroimidazoles with alkene-containing bromomethyl ketones and treatment of the so-formed 4,5-dihydroimidazolium ions with DBU gives rise to an intramolecular 1,3-dipolar cycloaddition reaction that affords ( via a reaction cascade involving eliminative ring-opening, recyclisation and prototropic tautomerism) unexpected hexahydropyrrolo[1,2,3-de] quinoxaline products. Steric bulk in both the dihydroimidazole and the dipolarophile allows isolation of an imidazo[ 1,2-a] indole, the initial product of cycloaddition. When the bromomethyl ketone contains no other functionality, or when cycloaddition is inhibited due to steric constraints, the dihydroimidazolium ion undergoes ring-opening hydrolysis followed by recyclization of the exposed amino ketone to afford either 3-alkyl-1-formylpiperazine-2-ones or 3-aryl-1-formyl-1,4,5,6-tetrahydropyrazines.

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Citation

Lory, P.M.J., Jones, R.C.F., Iley, J.N., Coles, S.J. and Hursthouse, M.B. (2006) Intramolecular 1,3-dipolar cycloadditions of dihydroimidazolium ylides: synthesis of pyrrolo[1,2,3-de] quinoxalines and imidazo[1,2-a]indoles Organic and Biomolecular Chemistry, 4, (16), pp. 3155-3165. (doi:10.1039/b605458g).

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Published date: 2006

Identifiers

Local EPrints ID: 44491
URI: http://eprints.soton.ac.uk/id/eprint/44491
ISSN: 1477-0520
PURE UUID: c4921db0-4ffd-44b8-8082-17550d0461d9
ORCID for S.J. Coles: ORCID iD orcid.org/0000-0001-8414-9272

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Date deposited: 06 Mar 2007
Last modified: 17 Jul 2017 15:14

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Contributors

Author: P.M.J. Lory
Author: R.C.F. Jones
Author: J.N. Iley
Author: S.J. Coles ORCID iD
Author: M.B. Hursthouse

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