已开发出由铱-二氟配合物催化的各种2-烷基和2-芳基取代的喹喔啉衍生物的一般不对称氢化反应。在温和的反应条件下,可以以高收率和高达95%的良好至优异的对映选择性获得相应的生物学上相关的2-取代-1,2,3,4-四氢喹喔啉单元。催化剂比为S / C = 1000且以克为单位,Ir-二氟膦配合物的催化活性得以保持,并显示出其潜在价值。最后,我们证明了我们的方法在化合物(S)-9的合成中的应用,该化合物是胆固醇酯转移蛋白(CETP)的抑制剂。
Water as a hydride source: A new pathway to form metal–hydride bonds has been developed through the reaction of easily available metal–silyl compounds with water. This method has been successfully applied to asymmetrichydrogenation of heteroaromatic compounds with up to 93 % ee under mild autoclave‐free conditions (see scheme).
terminal epoxides into valuable 1,2,3,4-tetrahydroquinoxalines in a highly enantioselective fashion. This procedure operates through relay zinc and iridiumcatalysis, and achieves redox-neutral and stereoconvergent production of valuable chiral heterocycles from racemic starting materials with water as the only side product. The use of commercially available reagents and catalysts and a convenient procedure
Iridium‐Difluorphos‐Catalyzed Asymmetric Hydrogenation of 2‐Alkyl‐ and 2‐Aryl‐Substituted Quinoxalines: A General and Efficient Route into Tetrahydroquinoxalines
AbstractA highly efficient and general iridium‐difluorphos‐catalyzed asymmetric hydrogenation of diverse 2‐alkyl‐ and 2‐aryl‐substituted quinoxalines into biologically and pharmaceutically relevant 2‐substituted‐1,2,3,4‐tetrahydroquinoxaline units has been developed. High isolated yields and excellent enantioselectivities of up to 95% for 2‐alkyl‐substituted quinoxalines and of up to 94% for 2‐aryl‐substituted quinoxalines were obtained.
General Asymmetric Hydrogenation of 2-Alkyl- and 2-Aryl-Substituted Quinoxaline Derivatives Catalyzed by Iridium-Difluorphos: Unusual Halide Effect and Synthetic Application
A general asymmetric hydrogenation of a wide range of 2-alkyl- and 2-aryl-substituted quinoxaline derivatives catalyzed by an iridium–difluorphos complex has been developed. Under mild reaction conditions, the corresponding biologically relevant 2-substituted-1,2,3,4-tetrahydroquinoxaline units were obtained in high yields and good to excellent enantioselectivities up to 95%. With a catalyst ratio
已开发出由铱-二氟配合物催化的各种2-烷基和2-芳基取代的喹喔啉衍生物的一般不对称氢化反应。在温和的反应条件下,可以以高收率和高达95%的良好至优异的对映选择性获得相应的生物学上相关的2-取代-1,2,3,4-四氢喹喔啉单元。催化剂比为S / C = 1000且以克为单位,Ir-二氟膦配合物的催化活性得以保持,并显示出其潜在价值。最后,我们证明了我们的方法在化合物(S)-9的合成中的应用,该化合物是胆固醇酯转移蛋白(CETP)的抑制剂。