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Closed Access item Expeditious entry to enantiopure mono- and bis(tricyclic) β-lactams by single or double [2+2] cycloaddition of allenynes

Authors:Alcaide, Benito
Almendros, Pedro
Aragoncillo, Cristina
Gómez-Campillos, G.
Issue Date:2011
Publisher:John Wiley & Sons
Citation:European Journal of Organic Chemistry null: 364-370 (2011)
Abstract:A thermal methodology for the expeditious preparation of structurally novel strained tricyclic β-lactams containing a cyclobutene ring has been developed. Besides, the first examples accounting for the intramolecular double [2+2] cycloaddition of bis(allenyne)s have been achieved through thermolysis of C2-symmetric or unsymmetric bis(β-lactam-allenyne)s, which have been prepared by copper-promoted alkyne homo- or cross-coupling reactions. The bis(tricyclic) ring structures bearing a central seven-membered ring arise from the regioselective cyclization of the alkyne with the distal bond of the allene, most likely via a radical intermediate. A variety of diversely functionalized mono- and bis(tricyclic) azetidinones can be prepared in good yield through a totally regioselective thermal [2+2] cycloadditionreaction of β-lactam-tethered allenynols, which may imply the formation of radical intermediates involving the distal allene bonds. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Identifiers:doi: 10.1002/ejoc.201001233
Appears in Collections:(IQM) Artículos

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