Alkyne as a Spectator Ligand for the Nickel-Catalyzed Multicomponent Connection Reaction of Diphenylzinc, 1,3-Butadiene, Aldehydes, and Amines
摘要:
Under nickel catalysis, in the presence of 3-hexyne, the aldimines of aromatic amines react with Ph2Zn and one molecule of butadiene to provide 1 exclusively, while the aldimines of aliphatic amines react with Ph2Zn and two molecules of butadiene to provide 2 exclusively, where 3-hexyne serves as a spectator ligand controlling the selective formation of 1 and 2.