Proton and carbon-13 nuclear magnetic resonance spectroscopy of diastereoisomeric 3- and 17 beta-tetrahydropyranyl ether derivatives of estrone and estradiol.
Protection of 3- and 17 beta-hydroxyl groups of estrone and estradiol as tetrahydropyranyl ether derivatives led to mixtures of 2'(R)- and 2'(S)-diastereoisomers which were separated by crystallization (3-tetrahydropyranyl ethers), or by thin-layer chromatography (17-tetrahydropyranyl ethers), and characterized by 1H and 13C nuclear magnetic resonance (NMR). Assignments for NMR signals of estradiol 3,17 beta-ditetrahydropyranyl ether were facilitated by comparison with those of its 15 zeta, 16 zeta-dideuterio analog and by 2D 1H-13C heteroshift correlation experiments. Diastereoisomers of 3-tetrahydropyranyl ether derivatives could be identified through the 13C NMR doublet signals of the anomeric C-2' and the aromatic C-4 carbon atoms in CDCl3. Diastereoisomers of 17-tetrahydropyranyl ether derivatives were recognized from characteristic modifications of 1H NMR signals of H-2', H-6', H-1, H-17, and 18-CH3 protons as well as from the 13C NMR doublet signals corresponding to C-2', C-4', C-6', C-12, C-13, C-16, and C-17 carbon atoms. Low-temperature experiments showed a splitting of the C-2', C-6', and C-17 13C NMR signals of each of the two 17-tetrahydropyranyl ether isomers. The downfield signal (equatorial conformer) of the three resulting doublets was more intense for the 17-tetrahydropyranyl ether 2'(S)-isomer, whereas the upfield signal (axial conformer) was more intense for the 2'(R)-isomer.
Boucheau
V
V
INSERM U 34, Unité de Recherches Endocriniennes et Métaboliques chez l'Enfant, Hôpital Debrousse, Lyon, France.
Renaud
M
M
Rolland de Ravel
M
M
Mappus
E
E
Cuilleron
C Y
CY
D002247:Carbon Isotopes; D003080:Cold Temperature; D004958:Estradiol / Q000031:analogs & derivatives*; D004970:Estrone / Q000031:analogs & derivatives*; D004987:Ethers; D009682:Magnetic Resonance Spectroscopy; D011522:Protons; D013237:Stereoisomerism
D002247:Carbon Isotopes; D004987:Ethers; D011522:Protons; D004970:Estrone; D004958:Estradiol