first example of metal-free B(C6F5)3-catalyzed asymmetric reduction amination of ketones with chiral α-methylbenzylamine (α-MBA) using ammonia borane as the reductant is reported. This one-pot method has a broad substrate scope and provides various chiralamines in 81–95% yield with 80–99% de. This protocol was further applied in the total synthesis of cinacalcet.
报道了使用氨硼烷作为还原剂,用手性α-甲基苄胺(α-MBA)进行的无金属的B(C 6 F 5)3催化的酮的不对称还原胺化的第一个实例。这种一锅法具有广泛的底物范围,并以81-95%的收率和80-99%的de提供了各种手性胺。该方案进一步应用于西那卡塞的全合成中。
Catalytic Enantioselective α-Allylation of Deconjugated Butenolides with Aza-π-allylpalladium 1,4-Dipoles: Access to Optically Pure 2-Piperidones Bearing an All-Carbon Quaternary Stereocenter
4-diploes, in situ generated from palladium-mediated decarboxylation of cyclic carbamates and amide-substituted acyclic carbonates, has been successfully developed. An array of enantioenriched 2-piperidones bearing an all-carbon quaternary stereocenter were obtained in highyields with excellent enantioselectivities (up to 99% yield and 99% ee). The utility of this method was also showcased by a large-scale