The synthesis and properties of tricyclic pimaranes containing a C-16 β-carboline are reported. A Pictet–Spengler reaction of methyl 15-oxo-16-formylisopimarate (prepared in situ from the 15-oxo-15,16-dihydroisopimarate) and tryptamine or tryptophan methyl ester in the presence of trifluoroacetic acid formed a mixture of terpenoid 1,2,3,4-tetrahydro-β-carbolines, 3,4-dihydro-β-carbolines, and β-carbolines. Tetrahydro- and dihydro-β-carbolines in CHCl3 were oxidized to the corresponding β-carbolines by treatment in air with basic Al2O3.
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Acknowledgment
The work was financially supported by RFBR Grants No. 17-43-543235 (p_mol_a) and No. 18-03-01012. Analytical and spectral studies were performed at the Khimiya Common Use Center at IOC, SB, RAS.
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For No. 37, see the literature [1].
Translated from Khimiya Prirodnykh Soedinenii, No. 5, September–October, 2019, pp. 749–755.
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Gromova, M.A., Kharitonov, Y.V., Rybalova, T.V. et al. Synthetic Transformations of Higher Terpenoids. 38.* Synthesis of Conjugates Containing β-Carboline and Tricyclic Diterpenoids. Chem Nat Compd 55, 871–877 (2019). https://doi.org/10.1007/s10600-019-02836-y
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DOI: https://doi.org/10.1007/s10600-019-02836-y