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. 2020 Jun 8;5(23):14116–14122. doi: 10.1021/acsomega.0c01648

Table 3. Key NMR Data of the Selected Norditerpenoid Alkaloids (δ in ppm).

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a

Orientation label: a = axial, e = equatorial in a chair conformation, b = bowsprit, and f = flagpole in a boat conformation. Chemical shifts of overlapping signals were extracted from HSQC.

b

With additional two drops of DMSO-d6.

c

With additional drops of DCl (35% in D2O), pD ∼2.

d

Chemical shift of this overlapping signal was extracted from COSY.

e

No evidence was obtained to identify the orientation of these protons unambiguously.

f

With additional two drops of pyridine-d5.

g

With additional two drops of pyridine-d5 and two drops of NaOD solution (30% in D2O, w/w).