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Zn(OTf)(2)-mediated annulations of N-propargylated tetrahydrocarbolines: divergent synthesis of four distinct alkaloidal scaffolds
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| Title: | Zn(OTf)(2)-mediated annulations of N-propargylated tetrahydrocarbolines: divergent synthesis of four distinct alkaloidal scaffolds |
| Authors: | Yorimoto, Sadaiwa Browse this author | | Tsubouchi, Akira Browse this author →KAKEN DB | | Mizoguchi, Haruki Browse this author →KAKEN DB | | Oikawa, Hideaki Browse this author →KAKEN DB | | Tsunekawa, Yoshiaki Browse this author | | Ichino, Tomoya Browse this author | | Maeda, Satoshi Browse this author →KAKEN DB | | Oguri, Hiroki Browse this author →KAKEN DB |
| Issue Date: | 14-Jun-2019 |
| Publisher: | Royal Society of Chemistry |
| Journal Title: | Chemical science |
| Volume: | 10 |
| Issue: | 22 |
| Start Page: | 5686 |
| End Page: | 5698 |
| Publisher DOI: | 10.1039/c9sc01507h |
| Abstract: | Intramolecular hydroarylations of N-propargylated tetrahydrocarbolines were efficiently mediated using a unique combination of Zn(OTf) 2 with t-BuOH under neutral conditions. Use of the artificial force induced reaction method in the global reaction route mapping strategy provided insights into the Zn(OTf) 2-mediated hydroarylations and the associated intriguing solvent effects of t-BuOH facilitating a protodezincation process without a Bronsted acid activator. We systematically implemented three distinct hydroarylations as well as an unanticipated a-alkenylation of a carbonyl group to obtain the four alkaloidal scaffolds 2-4, and 18. Zn(OTf) 2-mediated annulation of 1c proceeded through kinetic formation of the spiroindole 3c followed by an alkenyl shift and concomitant retro-Mannich-type fragmentation to furnish azepino[ 4,5-b] indole 2 framework. Substituents on substrate 1 in the vicinity of the reaction sites substantially affected the mode of the divergent annulations. Judicious choices of the substituents, solvent and reaction conditions enabled programmable divergent synthesis of the four distinct skeletons. |
| Rights: | https://creativecommons.org/licenses/by-nc/3.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/75263 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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