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The asymmetric inverse-electron-demand aza-Diels-Alder reaction of N-Ts-1-aza-1,3-butadienes derived from 3-argiocarbonylcoumarins and acetaldehyde has been developed using chiral secondary aminocatalysis, giving tricyclic chroman-2-one derivatives in high enantioselectivities (up to 95% ee).
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Li et al. (2010) studied this question.
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