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Synthesis of axially chiral N-aryl indoles by stereoselective nucleophilic aromatic substitution reactions of planar-chiral tricarbonyl(2,6-disubstituted-1 -fluorobenzene)chromium complexes, see: (a) Kamikawa, K.; Kinoshita, S.; Matsuzaka, H.; Uemura, S. Org. Lett. 2006, 8, 1097.
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Synthesis of axially chiral N-aryl indoles by stereoselective nucleophilic aromatic substitution reactions of planar-chiral tricarbonyl(2,6-disubstituted-1 -fluorobenzene)chromium complexes, see: (a) Kamikawa, K.; Kinoshita, S.; Matsuzaka, H.; Uemura, S. Org. Lett. 2006, 8, 1097.
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(a) Tanaka, K.; Takeishi, K.; Noguchi, K. J. Am. Chem. Soc. 2006, 128, 4586.
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+-xyl-BINAP-catalyzed concurrent construction of both C-C and C-N axial chiralities, see: Oppenheimer, J.; Hsung, R. P.; Figueroa, R.; Johnson, W. L. Org. Lett. 2007, 9, 3969.
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+-xyl-BINAP-catalyzed concurrent construction of both C-C and C-N axial chiralities, see: Oppenheimer, J.; Hsung, R. P.; Figueroa, R.; Johnson, W. L. Org. Lett. 2007, 9, 3969.
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For our accounts, see: a
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For our accounts, see: (a) Tanaka, K. Synlett 2007, 1977.
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Synlett
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(b) Tanaka, K.; Nishida, G.; Suda, T. J. Synth. Org. Chem. Jpn. 2007, 65, 862.
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+-modified-BINAP-catalyzed [2+2+2] cyclo-addition of alkynes with isocyanates, see: Tanaka, K.; Wada, A.; Noguchi, K. Org. Lett. 2005, 7, 4737.
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+-modified-BINAP-catalyzed [2+2+2] cyclo-addition of alkynes with isocyanates, see: Tanaka, K.; Wada, A.; Noguchi, K. Org. Lett. 2005, 7, 4737.
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A neutral rhodium(I)-complex-catalyzed [2+2+2] cycloaddition of alkynes with isocyanates, see: Kondo, T.; Nomura, M.; Ura, Y.; Wada, K.; Mitsudo, T. Tetrahedron Lett. 2006, 47, 7107.
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A neutral rhodium(I)-complex-catalyzed [2+2+2] cycloaddition of alkynes with isocyanates, see: Kondo, T.; Nomura, M.; Ura, Y.; Wada, K.; Mitsudo, T. Tetrahedron Lett. 2006, 47, 7107.
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Neutral rhodium(I)-complex-catalyzed enantioselective [2+2+2] cycloadditions of alkenyl isocyanates with alkynes, see: (a) Yu, R. T.; Rovis, T. J. Am. Chem. Soc. 2006, 128, 2782.
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Neutral rhodium(I)-complex-catalyzed enantioselective [2+2+2] cycloadditions of alkenyl isocyanates with alkynes, see: (a) Yu, R. T.; Rovis, T. J. Am. Chem. Soc. 2006, 128, 2782.
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For recent reviews of pyridone synthesis by transitionmetal-catalyzed [2+2+2] cycloadditions, see: (a) Heller, B.; Hapke, M. Chem. Soc. Rev. 2007, 36, 1085.
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For recent reviews of pyridone synthesis by transitionmetal-catalyzed [2+2+2] cycloadditions, see: (a) Heller, B.; Hapke, M. Chem. Soc. Rev. 2007, 36, 1085.
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General Procedure for the [2+2+2] Cycloaddition (Tables 2 and 3) Under an Ar atmosphere, a CH2Cl2 solution (0.5 mL) of (R)-BINAP (0.010-0.040 mmol, 5-20 mol, was added to a CH 2Cl2 solution (0.5 mL) of [Rh(cod)2]BF 4 (0.010-0.040 mmol, 5-20 mol, at r.t, and the mixture was stirred for 5 min. The resulting solution was stirred under H2 (1 atm) at r.t. for 1 h, concentrated to dryness, and dissolved in CH2Cl 2 (0.4 mL, To this solution was added a CH2Cl2 solution (0.7 mL) of 2 (0.220 mmol) and then a CH2Cl 2 solution (0.9 mL) of 1 (0.200 mmol) at r.t. After stirring at r.t. for 1-18 h, the resulting solution was concentrated and product 3 was isolated by a silica gel chromatography. Compound, )-3aa: colorless solid; mp 46.3-47.1 °C; [α]D25 +44.7 c 1.46, CHCl
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R = 18.5 min (minor isomer) and 21.2 min (major isomer).
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The high enantioselectivity observed in the reaction of 1a with 2a might be ascribed to a larger steric hindrance of 2a than those of 2b and 2c.
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The high enantioselectivity observed in the reaction of 1a with 2a might be ascribed to a larger steric hindrance of 2a than those of 2b and 2c.
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Kitagawa, O.; Izawa, H.; Sato, K.; Dobashi, A.; Taguchi, T. J. Org. Chem. 1998, 63, 2634.
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(1998)
J. Org. Chem
, vol.63
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Kitagawa, O.1
Izawa, H.2
Sato, K.3
Dobashi, A.4
Taguchi, T.5
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