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Trofimova A, White B, Diaz DB, Širvinskas MJ, Lough A, Dudding T, Yudin AK. A Boron Scan of Ethyl Acetoacetate Leads to Versatile Building Blocks. Angew Chem Int Ed Engl 2024; 63:e202319842. [PMID: 38277239 DOI: 10.1002/anie.202319842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 01/24/2024] [Accepted: 01/25/2024] [Indexed: 01/28/2024]
Abstract
Discovered in the 19th century, ethyl acetoacetate has been central to the development of organic chemistry, including its pedagogy and applications. In this study, we present borylated derivatives of this venerable molecule. A boron handle has been installed at either α ${{\rm \alpha }}$ - or β ${\beta }$ -position of acetoacetate by homologation of acyl-MIDA (N-methyliminodiacetic acid) boronates with diazoacetates. Either alkyl or boryl groups were found to migrate with regiochemistry being a function of the steric bulk of the diazo species. Boryl β ${{\rm \beta }}$ -ketoesters can be further modified into borylated pyrazolones and oximes, thereby expanding the synthetic toolkit and offering opportunities for additional modifications.
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Affiliation(s)
- Alina Trofimova
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON, M5S 3H6, Canada
| | - Brandon White
- Department of Chemistry, Brock University, St. Catharines, ON, L2S 3A1, Canada
| | - Diego B Diaz
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON, M5S 3H6, Canada
| | - Martynas J Širvinskas
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON, M5S 3H6, Canada
| | - Alan Lough
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON, M5S 3H6, Canada
| | - Travis Dudding
- Department of Chemistry, Brock University, St. Catharines, ON, L2S 3A1, Canada
| | - Andrei K Yudin
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON, M5S 3H6, Canada
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