A facile and efficient one-step synthesis of a novel phenanthroindolizine skeleton was developed via the Vilsmeier–Haack reaction of accessible 18-acetamino-7-oxo-dehydroabietane. The structure and stereochemistry were confirmed by NMR, HR-MS, elemental analysis, and X-ray crystal structure analysis (XSA), and the proposed reaction pathway for the Vilsmeier-Haack reaction includes an unusual conjugate addition of enol to chloromethyleneiminium salt and intramolecular cyclization reaction.
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Acknowledgment
The generous financial support of the Natural Science Foundation of China (31170536) is gratefully acknowledged. This project was funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Published in Khimiya Prirodnykh Soedinenii, No. 2, March–April, 2015, pp. 269–272.
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Liu, C., Hu, J., Xu, H. et al. Synthesis, Characterization, and Crystal Structure of a Phenanthroindolizine Skeleton from 18-Acetamino-7-Oxo-Dehydroabietane by Vilsmeier-Haack Reaction. Chem Nat Compd 51, 306–310 (2015). https://doi.org/10.1007/s10600-015-1266-z
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DOI: https://doi.org/10.1007/s10600-015-1266-z