Stereoselective Synthesis of Functionalized Chiral 2-Nitrocyclohexanecarboxylic Esters<i>via</i>Catalytic Dienamine Addition to β-Substituted β-Nitroacrylates
作者:Elisabetta Massolo、Maurizio Benaglia、Rita Annunziata、Alessandro Palmieri、Giuseppe Celentano、Alessandra Forni
DOI:10.1002/adsc.201301074
日期:2014.2.10
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