Unprecedented Halide Dependence on Catalytic Asymmetric Hydrogenation of 2-Aryl- and 2-Alkyl-Substituted Quinolinium Salts by Using Ir Complexes with Difluorphos and Halide Ligands
作者:Hiroshi Tadaoka、Damien Cartigny、Takuto Nagano、Tushar Gosavi、Tahar Ayad、Jean-Pierre Genêt、Takashi Ohshima、Virginie Ratovelomanana-Vidal、Kazushi Mashima
DOI:10.1002/chem.200901477
日期:2009.10.5
the key to achieving high catalytic activity and enantioselectivity on asymmetric hydrogenation of 2‐aryl‐ and 2‐alkyl‐substituted quinolinium salts. The reaction was catalyzed by a cationic dinuclear iridium(III) complex with difluorphos and chloride or bromide ligands and gave the corresponding 2‐substituted 1,2,3,4‐tetrahydroquinolines in high enantioselectivities (up to 95 % ee; see scheme, difluorphos=[(4
更好的方法:键合到铱原子上的卤化物配体是实现2芳基和2烷基取代的喹啉鎓盐不对称加氢的高催化活性和对映选择性的关键。阳离子双核铱(III)与二氟和氯化物或溴化物配体的催化反应,得到高对映选择性的二取代的1,2,3,4-四氢喹啉(最高95%ee;参见方案,二氟= [((4,4'-bi-2,2-二氟-1,3-苯并二恶唑)-5,5'-二基]双(二苯基膦))。