In trans 1,3-disubstituted 1,2,3,4-tetrahydro-β-carbolines the chemical shift of C-1 in the 13C n.m.r. spectrum is upfield of that for the corresponding peak of the cis-isomer, even for Nb-benzylated analogues; however, the chemical shift of the C-3 carbon is dependent on the Nb-substituent.
P. D. Bailey and S. P. Hollinshead, J. Chem. Soc., Chem. Commun., 1985, 1575 DOI: 10.1039/C39850001575
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