A catalyticenantioselectivesynthesis of dihydrofurans has been developed. 1,3-Dicarbonyl derivatives react with (E)-β,β-bromonitrostyrenes in the presence of a chiral bifunctional thiourea catalyst providing mild and efficient access to diverse polysubstituted dihydrofurans in good yields and enantioselectivities.
The asymmetric domino Michael-SN2 reaction of various 1,3-dicarbonyl compounds to α-bromonitroalkenes is described for the first time, employing readily available cinchona-derived bifunctionalthioureas as organocatalysts. The novel transformations were highly regio-, chemo-, diastereo-, and enantioselective, which simultaneously gave the chiral tricyclic 2,3-dihydrofurans, bicyclic 2,3-dihydrofurans
An asymmetric formal one‐pot reaction of 1,3‐dicarbonyl derivatives with non‐bromo‐substituted nitroolefins has been developed by merging a chiral bifunctional organocatalyst with molecular iodine.