A family of modularly designed chiral bis(1,3,2-diazaphospholidines) with N-aryl substituents (NP-PN) is reported. These compounds have been prepared in two steps from readily available (R,R)-1,2-diaminocyclohexane and tetrachlorodiphosphines. Examples in the set differ in the backbone and the aryl substituents, aiming at their application in asymmetric catalysis. Thus, [Rh(NBD)(NP-PN)]BF4 complexes
Palladium-diamine complexes catalyzed kineticresolution of axiallychiral 2,2'-dihydroxy-1,1'-biaryls by alcoholysis of vinyl ethers. The reaction proceeded with high selectivity for various kinds of biaryls. This process is applicable to not only binaphthols but also biphenols, which have been considered to be difficult for the enantioselective synthesis by known catalytic methods.
Copper(I) catalysis: Synthesis of N,N′-diarylated and N-aryl,N′-formylated chiral C2-symmetric diamines
作者:Laxhmaiah Alakonda、Mariappan Periasamy
DOI:10.1016/j.jorganchem.2009.08.002
日期:2009.11
Chiral N,N'-diaryl C-2-symmetric diamines and N-aryl, N'-formyl-trans-(1R,2R)-diaminocyclohexane are readily accessed by copper catalyzed N,N'-diarylation and N-aryl,N'-formylation of trans-(1R,2R)-diaminocyclohexane with aryl bromides. N, N'-diarylation using (R)-1,1'- binaphthyl-2,2'-diamine and iodobenzene gave the corresponding (R)-N,N'-diphenyl-1,1'-binaphthyl-2,2'-diamine derivative in 83% yield. (C) 2009 Elsevier B. V. All rights reserved.
Chiral Bis(<i>N</i>-arylamino)phosphine-oxazolines: Synthesis and Application in Asymmetric Catalysis
作者:Marc Schönleber、Robert Hilgraf、Andreas Pfaltz
DOI:10.1002/adsc.200800221
日期:2008.9.5
N-alkylation of chiral 1,2-diamines followed by ring closure with phosphorus trichloride (PCl3) and subsequent coupling with an oxazoline alcohol resulted in a new class of N,Pligands. The corresponding iridium tetrakis[3,5-bis(trifluormethyl)phenyl]borate (BArF) complexes were found to be efficient catalysts for the enantioselectivehydrogenation of unfunctionalized olefins and α,β-unsaturated carboxylic