Enantioselective Nitroso Aldol Reaction Catalyzed by a Chiral Phosphine-Silver Complex
作者:Akira Yanagisawa、Yuqin Lin、Akihiro Takeishi、Kazuhiro Yoshida
DOI:10.1002/ejoc.201601143
日期:2016.11
R)-QuinoxP* = (–)-(R,R)-2,3-bis(tert-butylmethylphosphino)quinoxaline] as the chiral precatalyst and N,N-diisopropylethylamine as the base precatalyst in the presence of methanol. Optically active α-aminooxy ketones with up to 99 % ee were regioselectively obtained in moderate to high yields by the in situ generated chiral silver enolates.
Asymmetric α-amination reaction of alkenyl trifluoroacetates catalyzed by a chiral phosphine–silver complex
作者:Akira Yanagisawa、Ryoji Miyake、Kazuhiro Yoshida
DOI:10.1039/c3ob42111b
日期:——
The asymmetric α-amination of alkenyltrifluoroacetates with dialkyl azodicarboxylates catalyzed by the DTBM-SEGPHOS·AgOTf complex takes place in the presence of 2,2,2-trifluoroethanol with almost quantitative yield and high ees of up to 97%.