Abstract
Structurally fused heterocycles encompassing a centerpiece of benzotropane are significant scaffolds with a plethora of promising biological activities, but such molecular architectures pose a long-standing daunting synthetic challenge. Herein, we reported a highly efficient asymmetric cyclodearomatization of 2-nitrobenzofurans with cyclic azomethine ylides by employing bifunctional phosphonium salts as phase-transfer catalysts. Under optimized reaction conditions, a diverse array of polycyclic benzofused tropane derivatives with four contiguous 4°/3° stereocenters were readily synthesized in both high yields and diastereoselectivities with up to >99% ee. The practicality and utility of this protocol were further demonstrated by the scaled-up reaction and facile elaborations. Moreover, preliminary investigations into their antitumor activities were also presented.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21971165, 21921002, 81630101), the National Key Research and Development Program of China (2018YFA0903500), the “1000-Youth Talents Program” (YJ201702) and the Fundamental Research Funds for the Central Universities. We also acknowledge the comprehensive training platform of the Specialized Laboratory in the College of Chemistry at Sichuan University and the Analytical & Testing Center of Sichuan University for compound testing.
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Dedicated to Professor Albert S. C. Chan on the occasion of his 70th birthday.
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Highly Stereoselective Construction of Polycyclic Benzofused Tropane Scaffolds and Their Latent Bioactivities: Bifunctional Phosphonium Salt-enabled Cyclodearomatization Process
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Tan, JP., Li, X., Chen, Y. et al. Highly stereoselective construction of polycyclic benzofused tropane scaffolds and their latent bioactivities: bifunctional phosphonium salt-enabled cyclodearomatization process. Sci. China Chem. 63, 1091–1099 (2020). https://doi.org/10.1007/s11426-020-9754-7
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DOI: https://doi.org/10.1007/s11426-020-9754-7