Thiaminediphosphatedependentenzymes are well known for catalyzing the asymmetricsynthesis of chiral α‐hydroxy ketones from simple prochiral substrates. The steric and chemical properties of the enzyme active site define the product spectrum. Enzymes catalyzing the carboligation of aromatic aldehydes to (S)‐benzoins have not so far been identified. We were able to close this gap by constructing
Chiral Frustrated Lewis Pairs Catalyzed Highly Enantioselective Hydrosilylations of 1,2-Dicarbonyl Compounds
作者:Xiaoyu Ren、Haifeng Du
DOI:10.1021/jacs.5b13104
日期:2016.1.27
A highlyenantioselectivehydrosilylation of 1,2-dicarbonyl compounds was successfully realized for the first time utilizing the combination of tricyclohexylphosphine and chiral alkenylborane derived in situ from diyne as a frustrated Lewis pair catalyst. A variety of optically active α-hydroxy ketones and esters were obtained in 52-98% yields with 86-99% ee's.
Base-Free Asymmetric Transfer Hydrogenation of 1,2-Di- and Monoketones Catalyzed by a (NH)<sub>2</sub>
P<sub>2</sub>
-Macrocyclic Iron(II) Hydride
作者:Lorena De Luca、Antonio Mezzetti
DOI:10.1002/anie.201706261
日期:2017.9.18
Base? No thanks! A hydride isonitrile iron(II) complex bearing a C2-symmetric diamino (NH)2P2 macrocyclic ligand catalyzes the asymmetric transferhydrogenation of ketones under base-free conditions with excellent enantioselectivity (up to 99 % ee). Base-labile benzoins are formed from the corresponding benzils with up to 95 % ee.
根据?不用了,谢谢!带有C 2对称二氨基(NH)2 P 2大环配体的氢化物异腈铁(II)络合物在无碱条件下催化酮的不对称转移氢化,具有出色的对映选择性(最高99%ee)。碱不稳定的安息香由相应的苯构成,其ee最高可达95%。
Organocatalytic Enantioselective Protonation for Photoreduction of Activated Ketones and Ketimines Induced by Visible Light
The first catalyticasymmetric photoreduction of 1,2‐diketones and α‐keto ketimines under visible light irradiation is reported. A transition‐metal‐free synergistic catalysis platform harnessing dicyanopyrazine‐derived chromophore (DPZ) as the photoredox catalyst and a non‐covalent chiral organocatalyst is effective for these transformations. With the flexible use of a chiral Brønsted acid or base in