Concept

Oxazole

Publications associées (25)

Role of vanadia species in V2O5/TiO2 catalysts for toluene partial oxidation

The partial oxidn. of toluene over V2O5/TiO2 catalysts is a reaction of industrial interest. In spite of the detailed study of the nature of surface vanadia species, there is an evident lack of the information concerning their reactivity. The present work ...

2000

Configurational and conformational control on formation and oligomerization of 2-C mono-arylated pseudo-proline dipeptide building units by aromatic stacking interactions

Christian Lehmann

Electrophilically induced cyclic acetal formation of the O-benzyl dipeptide esters Fmoc-NMeIle-Thr-OBn (1) and of Fmoc-Pro-Thr-OBn (6) has been observed to lead predominantly to the (R) diastereomers 2b and 8b at the 2-C position of the resulting substitut ...

1999

Enhancing the proline effect: Pseudo-prolines for tailoring cis/trans isomerization

Cis-trans isomerization of proline-like oxazolidines and thiazolidines, denoted pseudo-prolines, is investigated spectrophotometrically with a chymotrypsin coupled assay and by H-1 NMR. A series of peptides carrying substituents of varying stereochemistry ...

1998

Halogen shuffling in pyridines: site selective electrophilic substitutions of 2-chloro-6-(trifluoromethyl)pyridine

Fabrice Cottet

When treated with lithium diisopropylamide in THF at -85 Deg and subsequently with iodine, 2-chloro-6-(trifluoromethyl)pyridine is neatly converted into its 3-iodo deriv. The latter can be quant. isomerized to afford 2-chloro-4-iodo-6-(trifluoromethyl)pyri ...

1998

Competition between hetero-Diels-Alder and cheletropic addition of sulfur dioxide. Theoretical and experimental substituent effects on the relative stability of 3,6-dihydro-1,2-oxathiin-2-oxides (sultines) and 2,5-dihydrothiophene-1,1-dioxides (sulfolenes). Anomeric effects in sultine and 6-substituted derivatives

Pierre Vogel, Kurt Schenk

At low temperature and in the presence of CF3COOH, SO2 undergoes Diels-Alder additions with (E)-1-acetoxybutadiene (8d) giving a 1:10 mixture of diastereomeric 6-acetoxysultines (9d + 10d). The Van't Hoff plot for equilibria 8d + SO2 reversible arrow 9d + ...

1998

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