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. 2020 Mar 23;11:1511. doi: 10.1038/s41467-020-15345-2

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 7 — a Control reaction to exclude the formation of product 5j from insertion product 7. b Control reaction to exclude the formation of product 5j from cycloaddition product 8. c, d Control reactions to verify the involvement of enol intermediate with diazo ketone 2e and 2e’.