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DOI: 10.1055/s-2008-1032144
A Practical Route to 2,3-Di-/1,2,3-Trisubstituted Indolizines from α-EWG Ketene S,S-Acetals and Their Application in Bis(1-indolizinyl)methane Synthesis
Publication History
Publication Date:
31 January 2008 (online)

Abstract
An easy synthesis of 2,3-di-/1,2,3-trisubstituted indolizines has been developed via a formal [3+2] annulation of α-EWG ketene S,S-acetals with 2-pyridine-/2-quinolinecarbaldehyde. The disubstituted products are formed via an intramolecular aza-Michael addition and subsequent elimination of acetic acid, followed by desulfenylation assisted by acetic acid, whereas the trisubstituted products are obtained via a similar conjugate addition followed by elimination of alkanethiol. This strategy has been applied to the synthesis of bis(1-indolizinyl)methanes by the condensation of a 2,3-disubstituted indolizine with aldehydes/ketones in the presence of a catalytic amount of BF3·OEt2.
Key words
indolizines - α-EWG ketene S,S-acetals - bis(1-indolizinyl)methanes - annulation - condensation
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References
Crystal data for 7d: C29H23ClN4S2, yellowish, M = 527.08, monoclinic, space group P2 (1)/n, a = 15.109 (3) Å, b = 11.0197 (18) Å, c = 16.741 (3) Å, V = 2630.8 (7) Å3, α = 90.00, β = 109.287 (2), γ = 90.00, Z = 4, T = 293 K, F 000 = 1096, R1 = 0.0610, wR2 = 0.1646. The supplementary crystallographic data for this structure (CCDC 657119) can be obtained free of charge from the Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/products/csd/request.