Salen Promoted Enantioselective Nazarov Cyclizations of Activated and Unactivated Dienones
摘要:
A novel class of chiral 5,5'-di(2,4,6-trialkyl)-aryl salen-metal complexes have been developed and shown to catalyze highly enantioselective Nazarov cyclization reactions, giving rise to cyclopentenoids in 90:10-98:2 er. Significantly, the catalysts also promote, for the first time, highly enantioselective Nazarov reactions of "unactivated" dienones, producing hydrindenone products having in place three contiguous chiral centers.
A Cr(salen)-based metal–organic framework as a versatile catalyst for efficient asymmetric transformations
作者:Qingchun Xia、Yan Liu、Zijian Li、Wei Gong、Yong Cui
DOI:10.1039/c6cc06019f
日期:——
A porous Cr(salen)-MOF can serve as an efficient and effective heterogeneous catalyst for a series of important asymmetric transformations including Nazarov cyclization, aminolysis reaction, Diels-Alder and hetero Diels-Alder reactions, resulting...