Abstract

AbstractAn asymmetric Michael addition of 2‐oxochroman‐3‐carboxylate esters to trans‐β‐nitroolefins is described. This strategy can give direct access to dihydrocoumarin derivatives bearing adjacent quaternary and tertiary stereocenters with up to >99% yield, >20:1 dr, and >99% ee. The adduct was further transformed to a spiro‐dihydrocoumarin compound in three steps with good yield.magnified image

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