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For the most recent review on catalytic enantioselective Diels-Alder reactions, see: E. J. Corey, Angew. Chem. 2002, 114, 1724-1741; Angew. Chem. Int. Ed. 2002, 41, 1650-1667.
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3
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0043240876
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G. Desimoni, G. Faita, M. Guala, C. Pratelli, J. Org. Chem. 2003, 68, 7862-7866.
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Zema, M.6
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8
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4544321575
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note
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Norephedrine can neither be bought in nor imported into our country without serious health reasons. From a sample of (1R,2S)-norephedrine, ent-5 was synthesised in accordance to ref.[8] and tested instead of 5.
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9
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0037077817
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G. Desimoni, G. Faita, M. Guala, C. Pratelli, Tetrahedron: Asymmetry 2002, 13, 1651-1654.
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Evans, D.A.1
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13
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4544241196
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note
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The DA reaction run under the conditions reported in the Exp. Sect. with Gd(OTf)3 and pybox 6, after 24 h, gave [endo]/[exo] = 84:16, ee[(R)-3] = 57%, ee[(R)-4] = 26%.
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14
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4544382723
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note
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III range.
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15
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0036625262
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For a recent review on rare-earth metal triflates in organic synthesis, see: S. Kobayashi, M. Sugiura, H. Kitagawa, W. W.-L. Lam, Chem. Rev. 2002, 102, 2227-2302.
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