Ni(II)-Catalyzed Enantioselective Conjugate Addition of Acetylenes to α,β-Enones
摘要:
Alkynylaluminum reagents undergo enantioselective conjugate addition to cyclic alpha,beta-enones In the presence of chiral bisphosphine complexes of Ni(II).
Ni(II)-Catalyzed Enantioselective Conjugate Addition of Acetylenes to α,β-Enones
摘要:
Alkynylaluminum reagents undergo enantioselective conjugate addition to cyclic alpha,beta-enones In the presence of chiral bisphosphine complexes of Ni(II).
groups and ethylzinc carboxamidates from these ligands as catalysts for Et2Zn additions to aldehydes were reported. Excellent yields were obtained with moderate ee′s in Et2Zn additions to benzaldehyde derivatives, implying effectiveness of our newly designed catalytic structures as well as mediocre stereocontrol by these chiral ligands. Possible transition states were suggested based on the crystal structures