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h) T. Satoh, Y. Kawamura, M. Miura, M. Nomura, Angew. Chem. Int. Ed. Engl. 1997, 36, 1740-1742;
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A part of this work has been reported as a communication, see: Y. Hamashima, D. Hotta, M. Sodeoka, J. Am. Chem. Soc. 2002, 124, 11240-11241.
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27544454813
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[24]
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[24]
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108
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18444391501
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A recent example of the use of 1,3-diketones in asymmetric Michael reactions, see: B. Kreidler, A. Baro, W. Frey, J. Christoffers, Chem. Eur. J. 2005, 11, 2660-2667.
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0034986283
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A complex mixture was obtained under such basic conditions. The reasons for low yields under basic conditions have been discussed in the literature, see: J. Christoffers, Synlett, 2001, 723-732.
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Christoffers, J.1
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27544484273
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[24]
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[24]
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111
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0032937199
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TfOH itself was reported to promote the Michael reaction to give a racemic product, see: H. Kotsuki, K. Arimura, T. Ohishi, R. Maruzasa, J. Org. Chem. 1999, 64, 3770-3773;
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0842349047
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see also for hetero-Michael addition reactions: T. C. Wabnitz, J.-Q. Yu, J. B. Spencer, Chem. Eur. J. 2004, 10, 484-493.
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Wabnitz, T.C.1
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113
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27544491952
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note
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The space-filling model depicted in Figure 2 was generated by MM3 calculation using CAche 5.0.
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