Enantioselective Conjugate Addition Employing 2-Heteroaryl Titanates and Zinc Reagents
摘要:
A general strategy for the conjugate addition of 2-heteroaryl nucleophiles to cyclic enones, unsaturated lactones, and unsaturated lactams in high enantioselectivities and yields is reported. The use of 2-heteroaryl titanates and zinc reagents offers a practical alternative to 2-heteroarylboronic acids, which are prone to undergo protodeboronation.
Enantioselective rhodium-catalysed 1,4-additions of 2-heteroarylzinc donors using Me-DUPHOS
作者:Jérôme Le Nôtre、Joseph C. Allen、Christopher G. Frost
DOI:10.1039/b806098c
日期:——
The enantioselective 1,4-addition of 2-(substituted)thienylzinc and 2-furanylzinc reagents has been achieved (up to 99 : 1 er) using a complex derived from [Rh(C2H4)2Cl]2 and Me-DUPHOS.
The enantioselectivehydrogenation of endocyclic enones has been a historical problem for homogeneous catalysis. We herein report an efficient method to reduce endocyclic enones with molecular hydrogen. Catalyzed by a rhodium/Zhaophos complex, a variety of enones with five‐, six‐ or seven‐member ring were hydrogenated with high enantioselectivity (92%—99% ee). Excellent chemo‐ and enantioselectivity
Enantioselective Conjugate Addition Employing 2-Heteroaryl Titanates and Zinc Reagents
作者:Anna J. Smith、Lily K. Abbott、Stephen F. Martin
DOI:10.1021/ol9013975
日期:2009.9.17
A general strategy for the conjugate addition of 2-heteroaryl nucleophiles to cyclic enones, unsaturated lactones, and unsaturated lactams in high enantioselectivities and yields is reported. The use of 2-heteroaryl titanates and zinc reagents offers a practical alternative to 2-heteroarylboronic acids, which are prone to undergo protodeboronation.