Enantiomerically pure chiral phenazino-crown ethers: synthesis, preliminary circular dichroism spectroscopic studies and complexes with the enantiomers of 1-arethyl ammonium salts
Enantiomerically pure chiral crown ethers containing the phenazine unit [(R,R)-2–(S,S)-8] were prepared by two types of cyclization reactions. Ligands (R,R)-2, (R,R)-3, (S,S)-4, (R,R)-5, (R,R)-6 and (R,R)-7 were prepared from phenazine-1,9-diol 9 and the appropriate ditosylates (S,S)-10–(S,S)-15 in weak basic conditions with complete inversion of configuration. Ligands (S,S)-2, (S,S)-7 and (S,S)-8
Synthesis of new enantiopure dimethyl-substituted pyridino-18-crown-6 ethers containing a hydroxymethyl, a formyl, or a carboxyl group at position 4 of the pyridine ring for enantiomeric recognition studies
作者:József Kupai、Péter Huszthy、Marianna Katz、Tünde Tóth
DOI:10.3998/ark.5550190.0013.513
日期:——
An enantiomerically pure dimethyl-substituted pyrid ino-18-crown-6 ethercontaining a hydroxy- methyl group at position4 of the pyridinering (( S,S )-1) has been prepared. This by Swern oxidation gave the formyl-substituted (( S,S )-2), then by further oxidation carboxy-substituted (( S,S )-3) pyridino-18-crown-6ether derivatives. These enan tiopure dimethyl-substitutedpyridino-18-crown-6 ethers
new fluorescent enantiopure pyridino-18-crown-6 ethers containing a benzothiazole unit were prepared, and the enantiomeric discrimination of these sensor molecules toward the hydrogen perchlorate salts of 1-phenylethylamine, 1-(1-naphthyl)ethylamine, phenylglycine methyl ester and phenylalanine methyl ester was studied in acetonitrile by fluorescence spectroscopy. The ligands revealed appreciable or
Characterization of Chiral Host−Guest Complexation in Fast Atom Bombardment Mass Spectrometry
作者:Gabriella Pócsfalvi、Miklós Lipták、Péter Huszthy、Jerald S. Bradshaw、Reed M. Izatt、Károly Vékey
DOI:10.1021/ac950912x
日期:1996.3.1
between chiral crown ethers 1 and 2 and enantiomeric ammonium ions 4 and 5 was examined. The reference compound 3 (achiral host) was chosen to be similar in structure to the chiral crown ethers for quantitative measurements. Our approach is based on a formalism assuming an equilibrium: [chiral host + H](+) + [achiral host + chiral guest](+) right harpoon over left harpoon [chiral host + chiral guest](+)
Synthesis of new enantiopure dimethyl- and diisobutyl -substituted pyridino-18-crown-6 ethers containing a halogen atom or a methoxy group at position 4 of the pyridine ring for enantiomeric recognition studies
Newenantiomerically pure dimethyl- and diisobutyl-substituted pyridino-18-crown-6etherscontaining a halogen atom or a methoxy group at position4 of the pyridinering [(S,S)-1, (S,S)-2, (S,S)-3, (S,S)-4] have been synthesized. A new synthetic route and the solid state structure of the reported enantiopuredimethyl-substitutedpyridino-18-crown-6ether [(S,S)-5] containing a chlorine atom at position