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For a review on calycotomine see: (b) Kaufmann, T. S. Synthesis 2005, 339-360. See also ref 2c.
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Oxidative Mannich-type reactions: (a) Li, Z., Li, C.-J. J. Am. Chem. Soc. 2005, 127, 3672-3673.
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48249095393
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Indeed, the reaction with CuBr-TBHP as an oxidant did not proceed at all. Benzoquinone was also ineffective
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Indeed, the reaction with CuBr-TBHP as an oxidant did not proceed at all. Benzoquinone was also ineffective.
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91
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48249092929
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The crystallographic data for 2a have been deposited with the Cambridge Crystallographic Data Centre as supplementary no. CCDC 673878. These data can be obtained online free of charge.
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The crystallographic data for 2a have been deposited with the Cambridge Crystallographic Data Centre as supplementary no. CCDC 673878. These data can be obtained online free of charge.
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92
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48249101802
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A similar reaction mechanism is proposed in ref 28b
-
A similar reaction mechanism is proposed in ref 28b.
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93
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33947094357
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The initial reaction step in the oxidation with DDQ is believed to be hydrogen abstraction. See
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The initial reaction step in the oxidation with DDQ is believed to be hydrogen abstraction. See: Fu, P. P.; Harvey, R. G., Chem. Rev, 1978, 78, 317-361.
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For recent examples, see: a
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For the synthesis of racemic 24 see: Ihara, M.; Yamada, M.; Ishida, Y.; Tokunaga, Y.; Fukumoto, K. Heterocycle, 1997, 44, 531-536.
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For the synthesis of racemic 24 see: Ihara, M.; Yamada, M.; Ishida, Y.; Tokunaga, Y.; Fukumoto, K. Heterocycle, 1997, 44, 531-536.
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102
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48249089142
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The crystallographic data for 23 have been deposited with the Cambridge Crystallographic Data Centre as supplementary no. CCDC 670312. These data can be obtained online free of charge.
-
The crystallographic data for 23 have been deposited with the Cambridge Crystallographic Data Centre as supplementary no. CCDC 670312. These data can be obtained online free of charge.
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103
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For 13a, see: (a) Alonso, E.; Ramón, D. J.; Yus, M. Tetrahedron 1997, 53, 14355-14368.
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For 13e, see: (b) Coppola, G. M. J. Heterocycl. Chem. 1991, 28, 1769-1772.
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14c: (a) Ruchirawat, S.; Chaisupakitsin, M.; Patranuwatana, N.; Cashaw, J. L.; Davis, V. E. Synth. Commun. 1984, 14, 1221-1228.
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14c: (a) Ruchirawat, S.; Chaisupakitsin, M.; Patranuwatana, N.; Cashaw, J. L.; Davis, V. E. Synth. Commun. 1984, 14, 1221-1228.
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107
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0025159310
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14f and 14g: (b) Clark, R. D.; Berger, J.; Garl, P.; Weinhardt, K. K.; Spedding, M.; Kilpatrick, A. T.; Brown, C. M.; MacKinnon, A. C. J. Med. Chem. 1990, 33, 596-600.
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14f and 14g: (b) Clark, R. D.; Berger, J.; Garl, P.; Weinhardt, K. K.; Spedding, M.; Kilpatrick, A. T.; Brown, C. M.; MacKinnon, A. C. J. Med. Chem. 1990, 33, 596-600.
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