Issue 1, 2011

Cycloaddition of homochiral dihydroimidazoles: A 1,3-dipolar cycloaddition route to optically active pyrrolo[1,2-a]imidazoles

Abstract

N-Alkylation of optically active 1-benzyl-4-phenyl-4,5-dihydroimidazole with active alkyl halides and treatment of the so-formed 4,5-dihydroimidazolium ions with DBU in the presence of a range of electron-deficient alkene dipolarophiles, constitutes a ‘one-pot’ cascade terminating in a 1,3-dipolar cycloaddition reaction that affords optically active pyrrolo[1,2-a]imidazoles. Three bonds of the so-formed pyrrolidine moiety are constructed in this cascade. The cycloaddition follows an endo approach of dipole and dipolarophile with anti geometry of the dipole and facial selectivity derived from the phenyl substituent. Inter- and intramolecular cycloaddition modes are observed.

Graphical abstract: Cycloaddition of homochiral dihydroimidazoles: A 1,3-dipolar cycloaddition route to optically active pyrrolo[1,2-a]imidazoles

Supplementary files

Article information

Article type
Paper
Submitted
02 Aug 2010
Accepted
27 Sep 2010
First published
29 Nov 2010

Org. Biomol. Chem., 2011,9, 297-306

Cycloaddition of homochiral dihydroimidazoles: A 1,3-dipolar cycloaddition route to optically active pyrrolo[1,2-a]imidazoles

R. C. F. Jones, K. J. Howard, J. S. Snaith, A. J. Blake, W. Li and P. J. Steel, Org. Biomol. Chem., 2011, 9, 297 DOI: 10.1039/C0OB00529K

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