A Dramatic Effect of the Reaction Conditions on the Course of a Palladium-Catalyzed Cyclization of an Alkene Bearing a Vinyl Bromide and a Nucleophile: A New Route to the trans-Hydrindane System
- 1 September 1998
- journal article
- letter
- Published by Georg Thieme Verlag KG in Synlett
- Vol. 1998 (9) , 995-997
- https://doi.org/10.1055/s-1998-1829
Abstract
Upon treatment with catalytic Pd(dppe) in the presence of KH, the malonate derivative 3 underwent a Wacker-type cyclization leading exclusively to compound 4 having the trans-hydrindane system. However, the course of the cyclization is dramatically dependent on the reaction conditions, mainly on the nature of the base. In the presence of a carbonate, a quaternary ammonium salt and the catalytic system (Pd(OAc)2 + PPh3) the cyclization of the same substrate 3 led only to compounds resulting from an initial Heck reaction of the vinyl bromide on the neighbouring olefin.Keywords
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