Abstract
Methods are described for the stereoselective synthesis of alkenyl-substituted
cyclobutenediones from alkyl-substituted cyclobutenediones and aldehydes
in 70-91% yields using pyrrolidine as catalyst
under mild reaction conditions.
Key words
cyclobutenediones - γ-olefination - organocatalysis
References and Notes
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CCDC 809408 (3a ),
809409 (3k ), and 809407 (4a )
contain the supplementary crystallographic data for this paper. These
data can be obtained free of charge from The Cambridge Crystallographic
Data Centre via www.ccdc.cam.ac.uk/data_request/cif
