Organocatalytic asymmetric conjugate addition of substituted 5-benzylfurfurals to nitroalkenes based on stereocontrol of trienamine

[Display omitted] •Diaminomethylenemalononitrile is good catalyst for asymmetric ε-alkylation reactions.•High stereoselectivity by a methyl group at γ-position of 5-benzylfurfural.•Higher stereoselectivities in comparison with the previous reports. Asymmetric ε-alkylation reaction of substituted 5-benzylfurfural derivatives to nitroalkenes by controlling the stereochemistry of the trienamine intermediate resulted in corresponding ε-regioselective addition products in high yields, diastereoselectivities, and enantioselectivities.