An N-heterocyclic carbene iridium catalyst with metal-centered chirality for enantioselective transfer hydrogenation of imines
作者:Yanjun Li、Meng Lei、Wei Yuan、Eric Meggers、Lei Gong
DOI:10.1039/c7cc04691j
日期:——
carbene iridium complex featuring metal-centered chirality was designed and applied to the asymmetric transfer hydrogenation (ATH) of imines. Four strongly σ-donating carbon-based substituents (2 carbenes and 2 phenyl moieties), a chirality transfer directly from the stereogenic metal center to the C=N bond of substrates, as well as a restriction of catalyst deactivation by steric demanding substituents
Catalytic Enantioselective Synthesis of 3-Substituted Benzosultams via Corey-Bakshi-Shibata Reduction of Cyclic N-Sulfonylimines
作者:Dieter Enders、Matthias Seppelt
DOI:10.1055/s-0030-1259314
日期:2011.2
The catalytic asymmetric synthesis of 3-substituted benzo-fused sultams employing the Corey-Bakshi-Shibata reduction with catecholborane of the corresponding cyclic N-sulfonylimines is reported. Good to excellent yields (74-95%) and enantiomeric excesses (69-94%) are obtained.
Asymmetric hydrosilylations of N-sulfonyl ketimines and vicinal diimines with chiral boranes
作者:Ting Liu、Xiangqing Feng、Haifeng Du
DOI:10.1016/j.tetlet.2022.154202
日期:2022.11
A metal-free hydrosilylation of N-sulfonyl ketimines under the FLP catalysis has been realized to give optically active amines in high yields with up to 73% ee. Significantly, a chiral borane-catalyzed asymmetrichydrosilylation of vicinal diimines was also achieved, affording the desired cis-1,2-diamines with 12–70% ee’s.
N-磺酰基酮亚胺在 FLP 催化下的无金属氢化硅烷化反应已经实现,以高收率得到光学活性胺,ee 高达 73%。值得注意的是,还实现了手性硼烷催化的邻位二亚胺的不对称氢化硅烷化,提供了所需的 ee 为 12-70% 的顺式-1,2-二胺。