Synthesis 2023; 55(07): 1069-1078
DOI: 10.1055/a-2004-1279
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Silver-Catalyzed Ring Expansion of Activated N-Heteroarenes via 1,4-Dearomative Addition of Diazomethylphosphonates

Sekwang Baek
,
Hyundug Jen
,
Eun Jeong Yoo
This research was supported by the National Research Foundation of Korea­ (NRF; NRF-2022R1A2C2008981 and NRF-2021R1A5A6002803), funded by the Korean government. This research was also supported by Kyung Hee University (KHU-20191037).


Abstract

Phosphorus-containing N-heterocycles are important molecular motifs due to their unique structural features and biological activities. In this study, we developed a silver-catalyzed reaction for the construction of phosphorus-containing azepine derivatives via a domino-type dearomatization procedure, followed by ring expansion. In addition, diazomethylphosphonates were employed for the first time as nucleophiles in the 1,4-dearomative addition of activated N-heteroarenes, furnishing cyclopropane-fused piperidine intermediates that were readily restructured into their corresponding azepine derivatives. The reactivities of the diazomethylphosphonates in the developed dearomatization strategy were found to be superior to those of other diazo compounds, thereby resulting in the generation of the desired seven-membered N-heterocycles within a very short reaction time.

Supporting Information



Publikationsverlauf

Eingereicht: 28. November 2022

Angenommen nach Revision: 27. Dezember 2022

Accepted Manuscript online:
27. Dezember 2022

Artikel online veröffentlicht:
31. Januar 2023

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