Highly enantioselective intramolecular Michael reactions by d-camphor-derived triazolium salts
作者:Yi Li、Xue-Qiang Wang、Chao Zheng、Shu-Li You
DOI:10.1039/b914805a
日期:——
Camphor-derived chiral triazolium salts have been found to be highly efficient for asymmetric intramolecular Michael reactions. With 1–5 mol% of the catalyst, the desired products were obtained in excellent yields, with up to 99% ee.
Chiral N-heterocyclic carbene/Lewis acid cooperative catalysis of the reaction of 2-aroylvinylcinnamaldehydes: a switch of the reaction pathway by Lewis acid activation
作者:Zhan-Yong Wang、Ya-Li Ding、Gang Wang、Ying Cheng
DOI:10.1039/c5cc08866f
日期:——
The chiralN-heterocycliccarbene/Lewis acid co-catalyzed reaction of 2-aroylvinylcinnamaldehydes produced good yields of indeno[1,2-c]furan-1-one derivatives with excellent enantioselectivity and diastereoselectivity. A switch of intramolecular cyclization to intermolecular dimerization was achieved...
A Highly Enantioselective Intramolecular Michael Reaction Catalyzed by N-Heterocyclic Carbenes
作者:Eric M. Phillips、Manabu Wadamoto、Audrey Chan、Karl A. Scheidt
DOI:10.1002/anie.200605235
日期:2007.4.20
Catalytic Asymmetric Reductive Michael Cyclization
作者:Jung Woon Yang、Maria T. Hechavarria Fonseca、Benjamin List
DOI:10.1021/ja055735o
日期:2005.11.1
reduction-Michael cyclization of enal enones has been developed. Accordingly, treating the enal enone with a Hantzsch dihydropyridine in the presence of a catalytic amount of an imidazolidinone organocatalyst provides cyclic keto aldehydes in high yields and enantiomeric excesses. The reaction works well with aliphatic and aromatic substrates in the synthesis of five- and six-membered carbacyclic derivatives.