Abstract
Factors leading to the formation of a hexahydroaporphine-like cyclizing side product were studied systematically for the first time and the ratio of this side product was controlled effectively. To understand better the electronic effect of substrates on the formation of side products, different 1-benzyloctahydroisoquinolines with substituted groups on nitrogen or benzene ring were compared. A plausible mechanism of cyclizing reaction was proposed, and key intermediates as well as transition states were analyzed using DFT calculations.
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Acknowledgments
The work was supported by the National Nature Science Foundation of China (NSFC, 21272069, 20672035), the Fundamental Research Funds for the Central Universities, the Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, the Swedish research council, and the Faculty of science at University of Gothenburg.
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Zhao, Q., Zhao, K., Wu, Sy. et al. On the formation of a side product with hexahydroaporphine-like structure in the Grewe cyclization of dextromethorphan. Res Chem Intermed 43, 1689–1708 (2017). https://doi.org/10.1007/s11164-016-2723-4
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DOI: https://doi.org/10.1007/s11164-016-2723-4