Chiral Bis(N-sulfonylamino)phosphine- and TADDOL-Phosphite-Oxazoline Ligands: Synthesis and Application in Asymmetric Catalysis
作者:Robert Hilgraf、Andreas Pfaltz
DOI:10.1002/adsc.200404168
日期:2005.1
has been prepared, containing a chiral oxazoline ring and as a second chiral unit a bis(N-sulfonylamino)phosphine group embedded in a diazaphospholidine ring or a cyclic phosphite group derived from TADDOL. These modular ligands are readily synthesized from chiral amino alcohols and chiral 1,2-diamines or TADDOLs. Palladium and iridium complexes derived from these ligands were found to be efficient catalysts
Zwitterionic Iridium Complexes with P,N-Ligands as Catalysts for the Asymmetric Hydrogenation of Alkenes
作者:Axel Franzke、Andreas Pfaltz
DOI:10.1002/chem.201003314
日期:2011.4.4
Several zwitterionic iridium complexes based on chiralP,N‐ligands with imidazoline or oxazoline donors and anionic tetraarylborate or aryltrifluoroborate substituents have been synthesized. The corresponding cationic analogues have also been prepared, to evaluate the effect of the covalent linkage between the anion and the cationic metal complex in catalytic reactions. The respective pairs of structurally
Origin of the asymmetric induction in metallosalen-catalyzed reactions of aldehydes
作者:Wojciech Chaładaj、Janusz Jurczak
DOI:10.1039/b910473a
日期:——
played by the structure of the diamine moiety of salen chromium complexes in determining the catalyst conformational equilibrium and, in consequence, the direction of asymmetricinduction in metallosalen-catalyzed reactions of aldehydes.
A New, Short, and Stereocontrolled Synthesis of <i>C</i><sub>2</sub>-Symmetric 1,2-Diamines
作者:Rajender Vemula、Nathan C. Wilde、Rajendar Goreti、E. J. Corey
DOI:10.1021/acs.orglett.7b01768
日期:2017.7.21
reaction of ammonia, glyoxal hydrate, and cyclohexanone. It is a very useful precursor for the diastereocontrolled synthesis of many C2-symmetric 1,2-diamines, a class which is important for the generation of a variety of C2-symmetric reagents and catalysts for enantioselective synthesis.
Influence of the metal and chiral diamine on metal(II)salen catalysed, asymmetric synthesis of α-methyl α-amino acids
作者:Yuri N Belokon、Jose Fuentes、Michael North、Jonathan W Steed
DOI:10.1016/j.tet.2004.02.025
日期:2004.3
The influence of the metal ion and chiral diamine used to form a metal(salen) complex on the catalytic activity of the complex in the asymmetric benzylation of an alanine enolate was investigated. Only metal ions which could form square-planar complexes gave catalytically active complexes, and best results were obtained with metal ions from the first row of transitionmetals, particularly copper(II)