| Autor: |
Timothy H. Warren, Otome E. Okoromoba, Eun Sil Jang, Thomas R. Cundari, Claire L. McMullin |
| Rok vydání: |
2019 |
| Předmět: |
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| DOI: |
10.26434/chemrxiv.11407116.v1 |
| Popis: |
α-substituted ketones are important chemical targets as synthetic intermediates as well as functionalities in in natural products and pharmaceuticals. We report the sp3 C-H α-acetylation of sp3 C-H substrates R-H with arylmethyl ketones ArC(O)Me to provide α-alkylated ketones ArC(O)CH2R at RT with tBuOOtBu as oxidant via copper(I) β-diketiminato catalysts. Proceeding via alkyl radicals R•, this method enables α-substitution with bulky substituents without competing elimination that occurs in more traditional alkylation reactions between enolates and alkyl electrophiles. DFT studies suggest the intermediacy of copper(II) enolates [CuII](CH2C(O)Ar) that capture alkyl radicals R• to give R-CH2C(O)Ar under competing dimerization of the copper(II) enolate to give the 1,4-diketone ArC(O)CH2CH2C(O)Ar. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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