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Sarkar S, Singh P, Edin S, Wendt OF, Almqvist F. Synthesis of Three-Dimensional Ring Fused Heterocycles by a Selective [4 + 2] Cycloaddition Between Bicyclic Thiazolo 2-Pyridones and Arynes. J Org Chem 2024; 89:731-739. [PMID: 38093677 PMCID: PMC10777404 DOI: 10.1021/acs.joc.3c01957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 11/15/2023] [Accepted: 11/24/2023] [Indexed: 01/06/2024]
Abstract
A selective [4 + 2] cycloaddition reaction of thiazolo-2-pyridones with arynes has been demonstrated. The developed protocol allows rapid access to highly functionalized, structurally complex thiazolo-fused bridged isoquinolones in high yields, which are susceptible to further late-stage functionalization.
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Affiliation(s)
- Souvik Sarkar
- Department
of Chemistry, Umeå University, 901 87 Umeå, Sweden
| | - Pardeep Singh
- Department
of Chemistry, Umeå University, 901 87 Umeå, Sweden
| | - Simon Edin
- Centre
for Analysis and Synthesis, Lund University, SE-221 00 Lund, Sweden
| | - Ola F. Wendt
- Centre
for Analysis and Synthesis, Lund University, SE-221 00 Lund, Sweden
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Meng FT, Wang YN, Qin XY, Li SJ, Li J, Hao WJ, Tu SJ, Lan Y, Jiang B. Azoarene activation for Schmidt-type reaction and mechanistic insights. Nat Commun 2022; 13:7393. [PMID: 36450750 PMCID: PMC9712421 DOI: 10.1038/s41467-022-35141-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 11/18/2022] [Indexed: 12/04/2022] Open
Abstract
The Schmidt rearrangement, a reaction that enables C-C or C-H σ bond cleavage and nitrogen insertion across an aldehyde or ketone substrate, is one of the most important and widely used synthetic tools for the installation of amides and nitriles. However, such a reaction frequently requires volatile, potentially explosive, and highly toxic azide reagents as the nitrogen donor, thus limiting its application to some extent. Here, we show a Schmidt-type reaction where aryldiazonium salts act as the nitrogen precursor and in-situ-generated cyclopenta-1,4-dien-1-yl acetates serve as pronucleophiles from gold-catalyzed Nazarov cyclization of 1,3-enyne acetates. Noteworthy is that cycloketone-derived 1,3-enyne acetates enabled ring-expansion relay to access a series of 2-pyridone-containing fused heterocycles, in which nonsymmetric cycloketone-derived counterparts demonstrated high regioselectivity. Aside from investigating the scope of this Schmidt-type reaction, mechanistic details of this transformation are provided by performing systematic theoretical calculations.
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Affiliation(s)
- Fan-Tao Meng
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China
| | - Ya-Nan Wang
- College of Chemistry and Institute of Green Catalysis, Zhengzhou University, Zhengzhou, Henan, 450001, China
| | - Xiao-Yan Qin
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China
| | - Shi-Jun Li
- College of Chemistry and Institute of Green Catalysis, Zhengzhou University, Zhengzhou, Henan, 450001, China
| | - Jing Li
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China
| | - Wen-Juan Hao
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - Shu-Jiang Tu
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China
| | - Yu Lan
- College of Chemistry and Institute of Green Catalysis, Zhengzhou University, Zhengzhou, Henan, 450001, China.
| | - Bo Jiang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
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