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We have corrected (Tetrahedron 2013, 69, 5859–5866) the structures of diterpenoid alkaloids reported in the Journal of Natural Products 2012, 75, 1145–1159. Our follow-up experiments compel us to present further revisions and clarifications on the diterpenoid alkaloids:(1) The naturally occurring forms of carmichaelines B, C, and D in Shi's paper (Journal of Natural Products 2012, 75, 1145–1159) are...
Eleven C 19 -diterpenoid alkaloids reported in Shi's paper were isolated or synthesized. Their 13 C NMR and DEPT spectra were recorded using (CD 3 ) 2 CO+TFA as solvents. Comparison of the acquired NMR data with those reported in Shi's paper, in combination with the fact that all alkaloids, expect for 8, 27, and 28, reported in Shi's paper were isolated using TFA as...
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