Enantioselective cooperative triple catalysis: unique roles of Au(<scp>i</scp>)/amine/chiral Brønsted acid catalysts in the addition/cycloisomerization/transfer hydrogenation cascade
作者:Nitin T. Patil、Vivek S. Raut、Ramesh Babu Tella
DOI:10.1039/c2cc37623g
日期:——
An enantioselective cooperative process involving the concerted/simultaneous action of three different catalysts i.e. Au(I)/amine/chiral Bronsted acid catalysts has been realized for the synthesis of 2-substituted tetrahydroquinolines from 2-aminobenzaldehydes and terminal alkynes.
synthesis of chiral tetrahydroquinoline derivatives with excellent enantioselectivities and high yields has been developed through one‐pot cascade biomimetic reduction. The detailed reaction pathway includes the acid‐catalyzed and ruthenium‐catalyzedformation of aromatic quinoline intermediates and biomimetic asymmetric reduction.
Highly Enantioselective SPINOL-Derived Phosphoric Acid Catalyzed Transfer Hydrogenation of Diverse C=N-Containing Heterocycles
作者:Yiliang Zhang、Rong Zhao、Robert Li-Yuan Bao、Lei Shi
DOI:10.1002/ejoc.201500330
日期:2015.5
A highly efficient and enantioselectivehydrogenation of diversely substituted C=N-containing heterocyclic compounds such as 3-aryl-1,4-benzoxazines and 2-arylquinolines was experimentally explored by using 1,1′-spirobiindane-7,7′-diol-derived chiral phosphoric acids as the catalyst. This method provides straightforward access to the corresponding tetrahydroquinolines and dihydro-2H-1,4-benzothiazines
Cooperative Organocatalysis: A Systematic Investigation of Covalently Linked Organophosphoric Acids for the Stereoselective Transfer Hydrogenation of Quinolines
A series of covalently linked bis‐ and trisphosphoric acids was investigated for their application in the stereoselective transfer‐hydrogenation of quinolines. In a combined experimental and theoretical study, it was found that the number and relative positioning of the chiral 1,1′‐binaphthyl‐phosphoric acid groups strongly influences the stereoselectivity of the reaction, based on two competing reaction