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2 For details, see the Supporting Information.
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2 For details, see the Supporting Information.
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29
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62349116588
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For a recent review on oxidative coupling reactions with gold see: a) H. A. Wegner Chimia 2009 63, 44-48;
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for a report on the gold-catalyzed oxidative homodimerization of coumarins with an external oxidant, see: e) H. A. Wegner. S. Ahles, M. Neuburger Chem. Eur. J 2008 14 11310-11313.
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II, see: S. Ma, Z. Yu Org. Lett 2003,5 1507-1510.
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For details, see the Supporting Information.
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For details, see the Supporting Information.
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38
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77951190177
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2 but without Selectfluor afforded 4a as the only product: for details, see the Supporting Information.
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2 but without Selectfluor afforded 4a as the only product: for details, see the Supporting Information.
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43
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33748774422
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For selected recent reports of vinylgold(I) complexes acting as nucleophiles, see: a) P. Dubé. F. D. Toste, J Am. Chem. Soc 2006 128 12062-12063:
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77951202986
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Alternatively the diorganogold(III) species could be formed through oxyauration of a second molecule of the allenoate by B or by transmetalation between two gold(III) intermediates B.
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Alternatively the diorganogold(III) species could be formed through oxyauration of a second molecule of the allenoate by B or by transmetalation between two gold(III) intermediates B.
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50
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0041131760
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For examples of oxidative coupling with stoichiometric or substoichiometric AuIII without external oxidants, see: a) F. Zamora. P. Amo-Ochoa. B. Fischer. A. Schimanski, B. Lippert, Angew. Chem 1999. 111, 2415-2417;
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Angew. Chem. Int. Ed 1999 38. 2274-2275;
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53
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33748944146
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c) A. K. Sahoo. Y Nakamura. N. Aratani. K. S. Kim S. B. Noh H. Shinokubo. D. Kim. A. Osuka Org. Lett 2006 8 4141-4144:
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Sahoo, A.K.1
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Shinokubo, H.6
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Osuka, A.8
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56
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77951187081
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In addition, no β-fluorinated y-butenolide was observed upon oxidative cyclization of the alkyl-substituted tert-butyl 2-methylocta-2, 3dienoate with Selectfluor. This reaction led to a complex mixture of products.
-
In addition, no β-fluorinated y-butenolide was observed upon oxidative cyclization of the alkyl-substituted tert-butyl 2-methylocta-2, 3dienoate with Selectfluor. This reaction led to a complex mixture of products.
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57
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Efforts to prepare D were unsuccessful, see: C. Zhou, Z. Ma, Z. Gu, C Fu, S. Ma J. Org. Chem 2008 73 772-774.
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Zhou, C.1
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Gu, Z.3
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Ma, S.5
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58
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77951184482
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Subjecting a mixture of Ig and 6g to the standard oxidative cyclization conditions led smoothly to 5 g after 24 h with no consumption of 6g.
-
Subjecting a mixture of Ig and 6g to the standard oxidative cyclization conditions led smoothly to 5 g after 24 h with no consumption of 6g.
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59
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77951181454
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The authors thank the referees for insightful suggestions.
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The authors thank the referees for insightful suggestions.
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