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0344225777
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The similarly high enantioselectivities obtained with maleimide 4 and acyclic substrates 8a-g suggest a reactive s-trans conformation of the unsaturated imide in the conjugate addition reaction. If a Lewis acid mode of activation involving one-point binding is assumed, a simplified stereochemical model can be devised, such as the one below, that accounts for the observed facial selectivity. (equation presented)
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