Asymmetric Catalysis, Part 91: Enantioselective Monophenylation of cis-1,2-Cyclopentanediol with Triphenylbismuth Diacetate and Chiral Copper(II) Complexes as Catalysts
The monophenylation of cis-1,2-cyclopentanediol with triphenylbismuth diacetate in the presence of chiral Cu(II) complexes as catalysts gave cis-2-hydroxy-1-phenoxy-cyclopentane with enantiomeric excesses up to 38percent.The optically active ligands used were triamine derivatives of 2,6-bis(aminomethyl)pyridine and diamine derivatives of 2-(aminomethyl)pyridine.Selectivity in the monophenylation occurred only in the presence of the latter as auxiliary ligands. - Keywords.Enantioselective catalysis; Chiral Cu(II) complexes; Monophenylation; Triphenylbismuth diacetate; cis-1,2-Cyclopentanediol.
OPTICALLY ACTIVE PYRIDINE DERIVATIVES AS CATALYSTS IN THE ENANTIOSELECTIVE ADDITION OF DIETHYLZINC TO BENZALDEHYDE
A number of optically active pyridine-carbinols and aminopyridines have been prepared and checked as enantioselective catalysts in the addition of diethylzinc to benzaldehyde.
Cabras, M. Antonietta,Chelucci, Giorgio,Giacomelli, Giampaolo,Soccolini, Franco
p. 23 - 26
(2007/10/02)
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