A catalytic asymmetric vinylogous Mannich-type reaction of γ-halo-α,β-unsaturated N-acylpyrazoles and N-Boc-aldimines was disclosed, which afforded an array of halogenated (F-, Cl-, and Br-) allylic stereogenic carbon centers in high yields with good to high regio-, diastereo-, and enantioselectivities. The brominated product served as a suitable electrophile for common SN2 nucleophilic substitution
The diastereo- and enantioselective reductive coupling of vinylazaarenes with N-Boc aldimines is described, The reactions proceed using chiral copper-bisphosphine complexes in the presence of TMOS as a hydride source to give reductive coupling products in moderate to high enantioselectivities.