Several 1,2,3-trisubstituted tetrahydro-β-carboline diastereoisomers have been synthesized and studied by 1H and 13C n.m.r. methods and CD spectroscopy. The relative configurations and predominant conformation have been established.
G. Tóth, C. Szántay, G. Kalaus, G. Thaler and G. Snatzke, J. Chem. Soc., Perkin Trans. 2, 1989, 1849 DOI: 10.1039/P29890001849
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