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NMR spectra and stereochemistry of 1,5- and 1,6-disubstituted perhydrooxazolo[3,4-a] pyridines

✍ Scribed by Trevor A. Crabb; Andrew N. Trethewey

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
252 KB
Volume
27
Category
Article
ISSN
0749-1581

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The configurations and preferred conformations of some perhydrooxazolo[3,4-alquinolines and of the related 3,3a,4,5-tetrahydro-1H-oxazolo[3,4-u]quinolines have been assigned on the basis of their 'H NMR spectra. Comparison of the spectra of the two sets of compounds shows the effect of replacement o

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## Abstract The ^1^H NMR spectra of isomeric 5,6‐dimethyl‐2‐oxo‐1,4‐dioxans have been recorded and the pertinent chemical shifts and coupling constants determined. The parameters indicate that both isomers exist as an equilibrium mixture of interconverting half chair ring conformations.

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## Abstract The reaction between 6‐ and 7‐ketocyclopenta[__d__] [1,3]dioxane and methyl‐phenylmagnesium bromide gave in each case only one isomer of the 6‐hydroxy‐6‐methyl‐phenyl‐ and 7‐hydroxy‐7‐methyl‐phenylcyclopenta [__d__] [1,3]dioxanes. The configurations of these derivatives were determined