Diastereoselective addition of higher order cuprates and zinc-copper reagents to imines derived from (S)-1-phenylethylamine
作者:Marco Bandini、Pier Giorgio Cozzi、Achille Umani-Ronchi、Marzia Villa
DOI:10.1016/s0040-4020(99)00418-4
日期:1999.6
The diastereoselective addition of higher order (H.O.) cuprates and zinc-copper reagents to aliphatic and aromatic chiral iminesderivedfrom (S)-1-phenylethylamine was examined. Aliphatic chiral imines react with (Allyl)2CuCNLi2 and (n-Bu)2Cu(CN)Li2 in the presence of BF3·Et2O and Me3SiCl in high diastereoselection, while c-C6H11Cu(CN)ZnI and AllylCu(CN)ZnBr afford chiral amines in comparable yields
Incorporation of α-trifluoromethyl substituted α-amino acids into C-and N-terminal position of peptides and peptide mimetics using multicomponent reactions
作者:K. Burger、K. Mütze、W. Hollweck、B. Koksch
DOI:10.1016/s0040-4020(98)00291-9
日期:1998.5
Methodology for incorporation of α-trifluoromethyl substituted amino acids into the C-and N-terminal position of peptides and peptide mimetics via multicomponent reactions of the Passerini and Ugi type is described.
Multinuclear magnetic resonance study of oxaziridines
作者:Mane Čudić、Rudolf Herrmann
DOI:10.1002/mrc.1260310509
日期:1993.5
NMR data (13C, 15N, 17O) for the three ring atoms of various oxaziridines are compared. Their significance for the prediction of the enantioselectivity of the oxidation of sulphides by chiral oxaziridines is discussed.
Asymmetric synthesis of β-lactams. I. The reaction of dimethylketene silyl acetal with (S)-alkylidene(1-arylethyl)amines promoted by titanium tetrachloride
作者:Iwao Ojima、Shin-ichi Inaba
DOI:10.1016/s0040-4039(00)71491-2
日期:1980.1
Asymmetric synthesis of β-lactams by means of the reaction of dimethylketene silyl acetal with (S)-alkylidene(1-arylethyl)amines in the presence of titaniumtetrachloride was studied. The extent of the asymmetric induction was in the range of 44–78% (diastereomeric purity 72–89%) and the (S)-configuration was turned to be preferentially induced at the 4C position of the resulting β-lactams.
One-Pot Transformation of Aldehydes to Ketones via Minisci-Type Reaction of Imines
作者:Zakhar M. Rubanov、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1021/acs.orglett.3c03764
日期:2023.12.8
A method for the conversion of aldehydes to ketones via the preliminary formation of aldiminines is described. The imines are involved in acid promoted Minisci-type reaction with alkyl radicals generated fromesters of N-hydroxylphthalimide under photoredox conditions. Aminyl radical cations formed after the addition of the iminium ions are believed to be key intermediates, which determine the reaction