1526
M. Wohland, M. E. Maier
LETTER
(10) For reviews covering the synthesis of tetrahydropyrans, see:
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(b) Larrosa, I.; Romea, P.; Urpi, F. Tetrahedron 2008, 64,
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(11) For representative examples, see: (a) Schneider, C.;
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(16) Cross-metathesis/SN2¢ reaction: Lee, K.; Kim, H.; Hong, J.
Org. Lett. 2009, 11, 5202.
(17) Cross-metathesis/iodocyclization: Hiebel, M.-A.; Pelotier,
B.; Goekjian, P.; Piva, O. Eur. J. Org. Chem. 2008, 713.
(18) Cross-metathesis/oxa-Michael addition: Fuwa, H.; Noto,
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(23) For the first example of an Au(III)-catalyzed Meyer–
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(24) For Meyer–Schuster rearrangements of alkynols, see:
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(29) For preparation and structure of this catalyst, see:
Preisenberger, M.; Schier, A.; Schmidbaur, H. J. Chem.
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(30) We found the use of AgO2CCF3 (AgTFA) for the generation
of the active Au(I) catalyst to be more convenient over
AgSF6 because of its greater stability. In case of substrate
20a, it could be shown that the reaction to 21a works with
comparable yield with a catalyst generated from Ph3PAuCl
and AgSF6.
(31) (a) Liu, Y.; Xu, W.; Wang, X. Org. Lett. 2010, 12, 1448.
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(32) For some recent reviews of gold(I)-catalyzed reactions of
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3180. (c) Gorin, D. J.; Toste, F. D. Nature (London) 2007,
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Synlett 2011, No. 11, 1523–1526 © Thieme Stuttgart · New York