Several 14-hydroxy-E-homoeburnane diastereoisomers have been synthesized and studied by 1H and 13C n.m r spectroscopy. The relative configurations and predominating conformations have been established. It has been shown that previous assignments of C-17 and C-20 signals of trans-D/E-ring-fused Vinca alkaloids must be reversed.
G. Tóth, C. Szántay, L. Szabó, K. Nógrádi, G. Kalaus and C. Szántay, J. Chem. Soc., Perkin Trans. 2, 1985, 1319 DOI: 10.1039/P29850001319
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