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3
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0001038178
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Carretero, J. C.; García Ruano, J. L.; Lorente, A.; Yuste, F. Tetrahedron: Asymmetry 1993, 4, 177. For the Diels Alder reactions of enantiomerically pure sulfinyl maleimides, see: Arai, Y.; Matsui, M.; Koizumi, T.; Shiro, M. J. Org. Chem. 1991, 56, 1983.
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6
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0001262877
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Carretero, J. C.; García Ruano, J. L.; Lorente, A.; Yuste, F. Tetrahedron: Asymmetry 1993, 4, 177. For the Diels Alder reactions of enantiomerically pure sulfinyl maleimides, see: Arai, Y.; Matsui, M.; Koizumi, T.; Shiro, M. J. Org. Chem. 1991, 56, 1983.
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9
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For the use of 2 and 3 as Michael acceptors, see: Posner, G. H. Acc. Chem. Res. 1987, 20, 72.
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0343121963
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Hamdouchi, C.1
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0343121962
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note
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The use of bases or solvents different to those indicated (NaOH and i-PrOH) determines a substantial decrease of the yields.
-
-
-
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14
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0343121961
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note
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If the hydroxyacid intermediate is isolated, as described in ref. 7, the yield in the preparation of 2 is much lower (46% from 4).
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-
-
-
15
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-
0342687591
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note
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Significant NOE's of endo-6A and endo-6B. (matrix presented)
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18
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0000050414
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b) Arai, Y.; Kuwayama, S.-I.; Takeuchi, Y.; Koizumi, T. Tetrahedron Lett. 1985, 26, 6205. See also:
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Arai, Y.1
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0001411985
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0 donor-acceptor interaction, as well as a higher (less likely) electrostatic repulsion between the oxygens in these rotamers could be invoked to explain the larger population of the rotamers like B in acyclic esters and consequently the higher π-facial selectivity of their cycloadditions.
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