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The asymmetric synthesis of functionalized 2‐amino‐2‐chromene derivatives with high enantioselectivities via one‐pot tandem reactions of functionalized α,β‐unsaturated ketones with malononitrile catalyzed by 9‐amino‐9‐deoxyepiquinine (1a) in combination with (R)‐1,1′‐binaphth‐2,2′‐diyl hydrogen phosphate (1c) is reported for the first time.
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Xie et al. (2009) studied this question.
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