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See also, d K. B. Erzhanov, S. S. Kolkhosova, T. Sadykov, Zh. Org. Khim. 1989, 25, 1729-1732 (Chemical Abstracts: 112, 178623);
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See also, d) K. B. Erzhanov, S. S. Kolkhosova, T. Sadykov, Zh. Org. Khim. 1989, 25, 1729-1732 (Chemical Abstracts: 112, 178623);
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for a Brønsted acid promoted rearrangement, see: P. Barmettler, H.-J. Hansen, Helv. Chim. Acta 1990, 73, 1515-1573.
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c) for a Brønsted acid promoted rearrangement, see: P. Barmettler, H.-J. Hansen, Helv. Chim. Acta 1990, 73, 1515-1573.
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23
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34250708438
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There is yet another possible mechanism in Cu-promoted cyclizations of N-propargyl anilines (such as hydroarylation-type reactions). See: a) R. D. Dillard, D. E. Pavey, D. N. Benslay, J. Med. Chem. 1973, 16, 253;
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There is yet another possible mechanism in Cu-promoted cyclizations of N-propargyl anilines (such as hydroarylation-type reactions). See: a) R. D. Dillard, D. E. Pavey, D. N. Benslay, J. Med. Chem. 1973, 16, 253;
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The aromatic Claisen rearrangements of propargyl ether derivatives usually afford fused arenes containing a six-membered ring: a U. Koch-Pomeranz, H.-J. Hansen, H. Schmid, Helv. Chim. Acta 1973, 56, 2981-3004;
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The aromatic Claisen rearrangements of propargyl ether derivatives usually afford fused arenes containing a six-membered ring: a) U. Koch-Pomeranz, H.-J. Hansen, H. Schmid, Helv. Chim. Acta 1973, 56, 2981-3004;
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For a recent synthesis of indole compounds that involves a transition-metal-catalyzed cyclization, see: a
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For a recent synthesis of indole compounds that involves a transition-metal-catalyzed cyclization, see: a) R. C. Larock, E. K. Yum, M. D. Refvik, J. Org. Chem. 1998, 63, 7652-7662;
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43
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34250742450
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Although the formation mechanism of 4c and 18 remains unclear at present, it may involve the hydrogenation of a 1,2-dihydroquinoline derivative formed from 1c or 16 according to Scheme 1. However, the corresponding quinoline compounds, which are considered to be oxidized products, were not detected. See also: T. P. Forrest, G. A. Dauphinee, S. A. Deraniyagala, Can. J. Chem. 1985, 63, 412-417 and references [4a] and [16
-
Although the formation mechanism of 4c and 18 remains unclear at present, it may involve the hydrogenation of a 1,2-dihydroquinoline derivative formed from 1c or 16 according to Scheme 1. However, the corresponding quinoline compounds, which are considered to be oxidized products, were not detected. See also: T. P. Forrest, G. A. Dauphinee, S. A. Deraniyagala, Can. J. Chem. 1985, 63, 412-417 and references [4a] and [16].
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44
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34250751767
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A similar observation has been reported in the Brønsted acid-catalyzed rearrangement of N-propargyl anilines. See reference [5c].
-
A similar observation has been reported in the Brønsted acid-catalyzed rearrangement of N-propargyl anilines. See reference [5c].
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45
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34250699458
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The authors acknowledge the referees for their suggestion to examine the reaction of 1f.
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The authors acknowledge the referees for their suggestion to examine the reaction of 1f.
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46
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0037295193
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Although it has been reported that the activation mechanism in a transition-metal-promoted amino-Claisen rearrangement probably involves activation of the alkyne unit, as in metal-catalyzed hydroarylation, the amine unit can also be activated by the metal. See references [4a, 7, and [8, and Y. Yamamoto, J. Seta, H. Murooka, X.-H. Han, Inorg. Chem. Commun. 2003, 6, 202-205
-
Although it has been reported that the activation mechanism in a transition-metal-promoted amino-Claisen rearrangement probably involves activation of the alkyne unit, as in metal-catalyzed hydroarylation, the amine unit can also be activated by the metal. See references [4a], [7], and [8], and Y. Yamamoto, J. Seta, H. Murooka, X.-H. Han, Inorg. Chem. Commun. 2003, 6, 202-205.
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47
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1642603931
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2-Propanol was used as a hydrogen source in the transition-metal- catalyzed hydrogenation of 1,2-dihydroquinolines: a K. Fujita, C. Kitatsuji, S. Furukawa, R. Yamaguchi, Tetrahedron Lett. 2004, 45, 3215-3217;
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2-Propanol was used as a hydrogen source in the transition-metal- catalyzed hydrogenation of 1,2-dihydroquinolines: a) K. Fujita, C. Kitatsuji, S. Furukawa, R. Yamaguchi, Tetrahedron Lett. 2004, 45, 3215-3217;
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48
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34250774433
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see reference [3b] for the Brønsted acid promoted hydrogenation of oxygen analogues.
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b) see reference [3b] for the Brønsted acid promoted hydrogenation of oxygen analogues.
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