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Cascade Reaction of Camphor-Derived Diynes with Transition Metal Compounds

  • M. Fernanda N. N. Carvalho EMAIL logo , Armando J. L. Pombeiro , Gabriele Wagner , Bjørn Pedersen und Rudolf Herrmann
Veröffentlicht/Copyright: 2. Juni 2014
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Platinum(II) catalyzes the isomerization of camphor sulfonamide diynes in a cascade reaction involving annulation of a five-membered ring to the camphor skeleton, ring-enlargement by C-C bond cleavage, reduction of sulfur(VI) to sulfur(IV), and oxidation of a hydroxy group to a ketone. The reactions of the diynes with other transition metal compounds were also studied. Copper, gold and rhenium give final products similar to those obtained with simple Brønsted acids or halogens, mainly by annulation o f a five-membered ring to the camphor moiety, accompanied by reduction of a sulfonamide to a sulfinamide group, but lacking the ring-enlargement step. Palladium(II) occupies an intermediate position as both types o f products are obtained. The reaction mechanism and intermediates are discussed

Received: 1999-3-18
Published Online: 2014-6-2
Published in Print: 1999-6-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

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