Diastereoselective Synthesis of Thieno[3′,2′:4,5]cyclopenta[1,2-<i>d</i>][1,3]oxazolines − New Ligands for the Copper-Catalyzed Asymmetric Conjugate Addition of Diethylzinc to Enones
作者:Bianca Flavia Bonini、Elena Capitò、Mauro Comes-Franchini、Alfredo Ricci、Andrea Bottoni、Fernando Bernardi、Gian Pietro Miscione、Laurent Giordano、Andrew R. Cowley
DOI:10.1002/ejoc.200400351
日期:2004.11
Several new ligands featuring a rigid three ring skeleton have been prepared for the first time following a modular approach. Chirality has been introduced by use of an oxazoline moiety fused with a cyclopenta[b]thiophene backbone. The efficiency and stereochemical impact of these ligands on the copper-catalyzed enantioselective addition of Et2Zn to chalcone was examined and enantiomeric excesses up