摘要:
AbstractA metal‐free stereoselective catalytic addition of in situ generated dienamine to β‐nitroacrylates has been developed. Starting from simple α,β‐unsaturated ketones, highly functionalized chiral β‐nitrocyclohexanecarboxylic esters were obtained in a single step, in good yields and up to 98% ee. By an unprecedented mechanistic pathway, starting from the synthetically readily available E‐nitroacrylate, the present methodology allowed us to obtain as major product the isomer bearing a cis relative disposition between the nitro and the ester groups, which is not accessible via a classical Diels–Alder reaction.magnified image