Highly Enantioselective Catalytic Alkyl Propiolate Addition to Aliphatic Aldehydes
作者:Mark Turlington、Albert M. DeBerardinis、Lin Pu
DOI:10.1021/ol900667g
日期:2009.6.4
A novel H8BINOL-based chiral ligand (S)-3 is found to catalyze the alkyl propiolate addition to aliphatic aldehydes in the presence of ZnEt2 and Ti(OiPr)4 at room temperature with excellent enantioselectivity (89−97% ee).
发现一种新型的基于H 8 BINOL的手性配体(S)-3在室温下在ZnEt 2和Ti(O i Pr)4的存在下以优异的对映选择性(89-97%)催化丙酸烷基酯加成到脂肪族醛中ee)。
Pd-Catalyzed Asymmetric Larock Indole Synthesis to Access Axially Chiral <i>N</i>-Arylindoles
however, there has been no asymmetric version yet for the construction of indole-based axiallychiral N-arylindoles since its initial report in 1991. Herein we report the first example of an asymmetric Larock indole synthesis by employing a chiral sulfinamide phosphine (SadPhos) ligand (Ming-Phos) with palladium. It allows rapid construction of a wide range of axiallychiral N-arylindole compounds in
Cobalt-Catalyzed Enantioselective C–H Arylation of Indoles
作者:Nicolas Jacob、Yassir Zaid、João C. A. Oliveira、Lutz Ackermann、Joanna Wencel-Delord
DOI:10.1021/jacs.1c09889
日期:2022.1.19
3d-metal-catalyzed atroposelectivedirect arylation is reported, furnishing rare atropoisomeric C2-arylated indoles. Kinetic studies and DFT computation revealed an uncommon mechanism for this asymmetric transformation, with the oxidative addition being the rate- and enantio-determining step. Excellent stereoselectivities were reached (up to 96% ee), while using an unusual N-heterocyclic carbene ligand bearing an
Chiral square-planar Rh(I) complexes based on new C2-symmetric NHC ligands have been synthesized selectively in a few steps as single diastereoisomers. These chiral precatalysts were applied to the asymmetric transfer hydrogenation of 1-phenylpropanone and to the 1,2-addition of arylboronic acids to aldehydes. We demonstrated a proper functionalization of the aromatic rings connected to the nitrogen