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Beilstein J. Org. Chem. 2005, 1, No. 17, doi:10.1186/1860-5397-1-17
Graphical Abstract
Scheme 1: Annulation of the but-2-enolide ring.
Scheme 2: General Perkow reaction
Scheme 3: Novel reactions leading to the products 8 and 9.
Scheme 4: Reaction sites for the attack by P(OEt)3.
Scheme 5: Hypothetic intermediates in the formation of the products 8 and 9.