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12
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4544279947
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note
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The absolute configuration was determined to be the R enantiomer by comparison with the authentic sample.
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13
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0141630824
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Y. Nakamura, R. Matsubara, H. Kiyohara, S. Kobayashi, Org. Lett. 2003, 5, 2481.
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14
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4544240558
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note
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The E- and Z-enamide isomers were separated and isolated by column chromatography.
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17
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0026782770
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21
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0034629041
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An aza-ene-type reaction of enamines by a concerted pathway has been proposed: a) M. Nour, K. Tan, C. Cavé, D. Villeneuve, D. Desmaële, J. d'Angelo, C. Riche, Tetrahedron: Asymmetry 2000, 11, 995; however, copper-catalyzed asymmetric ene-type reactions of α-imino esters with alkenes have been reported.
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Nour, M.1
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22
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0032576117
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b) W. J. Drury III, D. Ferraris, C. Cox, B. Young, T. Lectka, J. Am. Chem. Soc. 1998, 120, 11 006;
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24
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4544388392
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note
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Experimental details are given in the Supporting Information.
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-
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25
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4544313718
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note
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2: C 61.53, H 4.61, N 3.88; found: C 61.37, H 4.70, N 3.80. Further details are given in the Supporting Information. CCDC-224229 (8) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from www.ccdc.cam.ac.uk/conts/retrieving.html, from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB21EZ, UK; fax: (+44)1223-336-033; or deposit@ccdc.cam.ac.uk.
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26
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0242350190
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Several di-μ-hydrodicopper(II) complexes are already known. The aerobic oxidation of a catechol derivative to the corresponding quinone (achiral synthesis) using the dicopper catalyst was reported: M. Kodera, T. Kawata, K. Kano, Y. Tachi, S. Itoh, S. Kojo. Bull. Chem. Soc. Jpn. 2003, 76, 1957.
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Kodera, M.1
Kawata, T.2
Kano, K.3
Tachi, Y.4
Itoh, S.5
Kojo, S.6
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27
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4544234335
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note
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Enamide 2d was treated with 1a in dichloromethane at 0°C for 15 min in the presence of 8 (10 mol %) to afford 5 aa in a yield of 78% and 8% ee.
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