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No substantial change of ee and dr was observed when using 10 equiv of 4, but the reaction was retarded significantly (84 h, 98% yield).
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note
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The corresponding benzene analogue showed no catalytic activity.
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3543077284
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note
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1H NMR and chiral HPLC analysis. The absolute configuration of the major adducts was assumed to be the same as in 6.
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