1H nuclear magnetic resonance studies of the conformations of vitamin D compounds in various solvents.

Abstract:

:Using proton NMR, the solution conformation of the A ring of vitamin D3 and its analogs has been studied by application of the Karplus relation to the observed coupling constants. The A-ring conformations of vitamins D3, D2, and 25-hydroxyvitamin D3 were found to be solvent dependent, with a clear preference for an equatorial hydroxyl group in polar solvents such as methanol and dimethyl sulfoxide. Conversion of the hydroxyl group to an acetate did not affect solution conformation appreciably, but the corresponding t-butyl-dimethylsilyl ether derivative of vitamin D3 showed a strong preference for the 3 beta-equatorial conformer. The A-ring conformation of the active hormone, 1,25-dihydroxyvitamin D3, which has two hydroxyl groups competing for the equatorial position, was found not to be solvent-dependent.

journal_name

Arch Biochem Biophys

authors

Helmer B,Schnoes HK,DeLuca HF

doi

10.1016/0003-9861(85)90587-9

subject

Has Abstract

pub_date

1985-09-01 00:00:00

pages

608-15

issue

2

eissn

0003-9861

issn

1096-0384

pii

0003-9861(85)90587-9

journal_volume

241

pub_type

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