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A mechanism via π-allyl intermediates has been proposed for cationic Rh(I)-bisphosphine complex-catalyzed isomerizations of allylic compounds. Allyl ethers: (a) Fatig, T.; Soulié, J.; Lallemand, J.-Y.; Mercier, F.; Mathey, F. Tetrahedron 2000, 56, 101.
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A mechanism via π-allyl intermediates has been proposed for cationic Rh(I)-bisphosphine complex-catalyzed isomerizations of allylic compounds. Allyl ethers: (a) Fatig, T.; Soulié, J.; Lallemand, J.-Y.; Mercier, F.; Mathey, F. Tetrahedron 2000, 56, 101.
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Allyl amines: (c) Nova, A.; Ujaque, G.; Albéniz, A. C.; Espinet, P. Chem. - Eur. J. 2008, 14, 3323.
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Allylic and propargylic alcohols: (e) Tanaka, K.; Shoji, T.; Hirano, M. Eur. J. Org. Chem. 2007, 2687.
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For selected recent examples of sequential olefin isomerization/Claisen rearrangement of di(allyl) ethers, see: (a) Kerrigan, N. J.; Bungard, C. J.; Nelson, S. G. Tetrahedron 2008, 64, 6863.
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For a Ag(I)-catalyzed propargyl Claisen rearrangement, see: Grissom, J. W.; Klingberg, D.; Huang, D.; Slattery, B. J. J. Org. Chem. 1997, 62, 603.
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For a Ag(I)-catalyzed propargyl Claisen rearrangement, see: Grissom, J. W.; Klingberg, D.; Huang, D.; Slattery, B. J. J. Org. Chem. 1997, 62, 603.
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32
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68249156211
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A thermal Claisen rearrangement of di(allyl) ethers followed by a Rh(I)-catalyzed intramolecular hydroacylation has been reported. See: Eilbracht, P.; Gersmeir, A.; Lennartz, D.; Huber, T. Synthesis 1995, 330.
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A thermal Claisen rearrangement of di(allyl) ethers followed by a Rh(I)-catalyzed intramolecular hydroacylation has been reported. See: Eilbracht, P.; Gersmeir, A.; Lennartz, D.; Huber, T. Synthesis 1995, 330.
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33
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2-catalyzed isomerization of allyl ethers, see: Mereyala, H. B.; Lingannagaru, S. R. Tetrahedron 1997, 53, 17501.
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2-catalyzed isomerization of allyl ethers, see: Mereyala, H. B.; Lingannagaru, S. R. Tetrahedron 1997, 53, 17501.
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34
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68249133325
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2 furnished 4h with 15% ee. These results clearly indicate that the cationic Rh(I) complex indeed catalyzes the propargyl Claisen rearrangement.
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2 furnished 4h with 15% ee. These results clearly indicate that the cationic Rh(I) complex indeed catalyzes the propargyl Claisen rearrangement.
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37
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70349784873
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and references therein
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(c) Yu, R. T.; Lee, E. E.; Malik, G.; Rovis, T. Angew. Chem., Int. Ed. 2009, 48, 2379, and references therein.
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Yu, R.T.1
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38
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68249161640
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Isolated crude 2a (ca. >90% purity) was indeed transformed into 3a in 72% isolated yield under the same conditions as entry 1, Table 3 [5 mol % Rh(I)-dppf, 80°C, 16 h].
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Isolated crude 2a (ca. >90% purity) was indeed transformed into 3a in 72% isolated yield under the same conditions as entry 1, Table 3 [5 mol % Rh(I)-dppf, 80°C, 16 h].
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