Preparation of enantiomers of 1-(1-naphthyl)-2,2-dimethylpropylamine and their behaviour as chiral solvating agents: study of diastereochemic association by Job's plots and intermolecular NOE measurements
摘要:
Enantiomers of 1-(1-naphthyl)-2,2-dimethylpropylamine have been obtained and considered as chiral solvating agents against several compounds. The formed complexes have been studied with the aid of the nuclear Overhauser effect and its stoichiometry by the method of continuous variations. Two diastereoisomeric complexes present similar geometry of association by pi-pi -stacking of the aromatic rings and by hydrogen bonding of the functional groups. (C) 2000 Elsevier Science Ltd. All rights reserved.
Nickel(0)-Catalyzed Enantioselective Annulations of Alkynes and Arylenoates Enabled by a Chiral NHC Ligand: Efficient Access to Cyclopentenones
作者:Joachim S. E. Ahlin、Pavel A. Donets、Nicolai Cramer
DOI:10.1002/anie.201408364
日期:2014.11.24
nickel‐catalyzed reductive [3+2] cycloaddition of α,β‐unsaturated aromatic esters and alkynes constitutes an efficient method for their synthesis. Here, nickel(0) catalysts comprising a chiral bulky C1‐symmetric N‐heterocyclic carbene ligand were shown to enable an efficient asymmetric synthesis of cyclopentenones from mesityl enoates and internal alkynes under mild conditions. The bulky NHC ligand
Chiral Cyclic Alkyl Amino Carbene (CAAC) Transition-Metal Complexes: Synthesis, Structural Analysis, and Evaluation in Asymmetric Catalysis
作者:Adrien Madron du Vigné、Nicolai Cramer
DOI:10.1021/acs.organomet.2c00351
日期:2022.10.10
Despite recent advances in the field of cyclicalkylaminocarbenes (CAACs) including a few complementary synthetic strategies affording CAACs with various substitution patterns, the application potential of chiral CAACs to efficiently catalyze asymmetric organometallic transformations remains largely underdeveloped. Herein, we describe a convenient and robust route that incorporates common chiral
Chiral NHC Ligands for Enantioselective Gold(I) Catalysis Under Aerobic Conditions: the Importance of Conformational Flexibility and Steric Hindrance of NHC Ligand on Reactivity
of chiral NHC−Au−Cl complexes, bearing sterically encumbered NHC ligands, has been accessed by merging anilines with commercially available chiral aminoalcohols and amines. Evaluation of the catalytic activity in enantioselective allenol cyclization has pointed out the importance of the steric hindrance and conformationalflexibility of the NHC core for reactivity. Ion metathesis between NHC−Au−Cl
An enantioselective C–H functionalization route to perfluoroalkyl-containing 3-azabicyclo[3.1.0]hexanes is disclosed. A modular and bench-stable diazaphospholane ligand enables highly enantioselective Pd(0)-catalyzed cyclopropane C–H functionalization using trifluoroacetimidoyl chlorides as electrophilic partners. In turn, the resulting cyclic ketimine products react smoothly with a broad variety of
Preparation of enantiomers of 1-(1-naphthyl)-2,2-dimethylpropylamine and their behaviour as chiral solvating agents: study of diastereochemic association by Job's plots and intermolecular NOE measurements
作者:A Port、A Virgili、A Alvarez-Larena、J.F Piniella
DOI:10.1016/s0957-4166(00)00334-7
日期:2000.9
Enantiomers of 1-(1-naphthyl)-2,2-dimethylpropylamine have been obtained and considered as chiral solvating agents against several compounds. The formed complexes have been studied with the aid of the nuclear Overhauser effect and its stoichiometry by the method of continuous variations. Two diastereoisomeric complexes present similar geometry of association by pi-pi -stacking of the aromatic rings and by hydrogen bonding of the functional groups. (C) 2000 Elsevier Science Ltd. All rights reserved.