Enantioselective Synthesis of Hemiaminals via Pd-Catalyzed C–N Coupling with Chiral Bisphosphine Mono-oxides
摘要:
A novel approach to hemiaminal synthesis via palladium-catalyzed C-N coupling with chiral bisphosphine mono-oxides is described. This efficient new method exhibits a broad scope, provides a highly efficient synthesis of HCV drug candidate elbasvir, and has been applied to the synthesis of chiral N,N-acetals.
Ir-Catalyzed C−H Amidation of Aldehydes with Stoichiometric/Catalytic Directing Group
作者:Yun-Fei Zhang、Bin Wu、Zhang-Jie Shi
DOI:10.1002/chem.201603805
日期:2016.12.5
Ir‐catalyzed sp2 C−Hamidation of aldehydes with various anilines as stoichiometric or catalytic directing groups was accomplished. A wide range of substrates were selectively amidated in good to excellent yields with broad functional group tolerance. The iridacycle complexes were isolated, characterized, and proved as key intermediates. Kinetic studies and Hammett plots provided detailed understandings
用各种苯胺作为化学计量或催化方向的基团,对醛进行了Ir催化的sp 2 CH酰胺化反应。以良好的产率和优异的产率选择性选择性地酰胺化各种底物,并具有宽泛的官能团耐受性。分离,表征并证明了iridacycle复合物是关键中间体。动力学研究和Hammett图提供了对这种酰胺化反应的详细了解。根据机理,证明了富电子的ArSO 2 N 3对于分子间sp 3 CH酰胺化有效。
Switchable Imine and Amine Synthesis Catalyzed by a Well-Defined Cobalt Complex
Switchable imine and amine synthesis catalyzed by a tripodal ligand-supported well-defined cobaltcomplex is presented herein. A large variety of primary alcohols and amines were selectively converted to imines or amines in good to excellent yields. It is discovered that the base plays a crucial role on the selectivity. A catalytic amount of base leads to the imine formation, while an excess loading
enantioselective hydrophosphonylation reaction of diisopropyl phosphite with aldimine furnished α-amino phosphonates with high enantioselectivities by means of a chiral phosphoric acid. DFT calculation of the effect of 3,3′-substituents of the phosphoric acid revealed the reason for the high enantioselectivities.
Ruthenium(0)-sequential catalysis for the synthesis of sterically hindered amines by C–H arylation/hydrosilylation
作者:Qun Zhao、Jin Zhang、Michal Szostak
DOI:10.1039/c9cc04072b
日期:——
imines and imine hydrosilylation. The method involves direct C–H arylation under neutral conditions with organoboranes enabled by ruthenium(0) catalysis. The catalytic hydrosilylation was performed in a one-pot fashion using Et3SiH. The reaction is compatible with a broad range of electronically- and sterically-varied imines, enabling rapid production of valuable biaryl amines in good to excellent yields
Formal Allylic C(sp<sup>3</sup>)–H Bond Activation of Alkenes Triggered by a Sodium Amide
作者:Wei Bao、Hanno Kossen、Uwe Schneider
DOI:10.1021/jacs.7b01542
日期:2017.3.29
alkenes under mild conditions. Subsequent C-C bond formations with imines have proceeded in high yields with complete regioselectivity and excellent geometric selectivity. Aromatic cyano, chloro, and bromo functionalities are tolerated by the transition metal-free catalyst. Complex amines bearing a C═C double bond and distinct heteroaromatic units have been prepared in a single step. The critical importance