Synthesis of New Chiral 2,2‘-Bipyridine Ligands and Their Application in Copper-Catalyzed Asymmetric Allylic Oxidation and Cyclopropanation
作者:Andrei V. Malkov、Daniele Pernazza、Mark Bell、Marco Bella、Antonio Massa、Filip Teplý、Premji Meghani、Pavel Kočovský
DOI:10.1021/jo034179i
日期:2003.6.1
rate (typicaly 30 min at room temperature) in allylic oxidation of cyclic olefins (52 --> 53). Copper-catalyzed cyclopropanation proceeded with < or =76% enantioselectivity and approximately 3:1 to 99:1 trans/cis-diastereoselectivity (54 --> 55 + 56). The level of the asymmetric induction is discussed in terms of the ligand architecture that controls the stereochemical environment of the coordinated