2004 Fiscal Year Final Research Report Summary
Synthetic Reactions of α-Ketenyl Radicals Based on Radical Carbonylations
| Project/Area Number |
15350061
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Synthetic chemistry
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
RYU Ilhyong Osaka Prefecture University, Department of Chemistry, Professor, 総合科学部, 教授 (80210821)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUYAMA Takahide Osaka Prefecture University, Department of Chemistry, Assistant Professor, 総合科学部, 助手 (60332962)
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| Project Period (FY) |
2003 – 2004
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| Keywords | α-ketenyl radical / carbon monoxid / radical carbonylation / vinyl radical / alkyne / amine |
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| Research Abstract |
Synthetic chemistry of a-ketenyl radicals was investigated based on the reaction of vinyl radicals and CO. The radical carbonylation of 1,5-enynes was investigated using (TMS)_3SiH (TTMSS) and hexanethiol as radical mediator, which gave cylopentanones via 5-exo cyclization of α,β-unsaturated acyl radicals onto C-C double bond. Radical carbonylation of alkynylamines with tributyltin hydride gives a mixture of α-methylene lactams and α-stannylmethylene lactams. Nucleophilic addition of an internal amino group to the carbonyl group of α-ketenyl radicals is suggested as the key cyclization step. The subsequent unusual 1,4-H shift from the resulting 1-hydroxyallyl radical, followed by elimination of the β-tributyltin radical leads to the formation of α-methylene lactams. This radical/ionic combined concept can be extended to include intermolecular tripping reactions of α-ketenyl radicals by amines. The treatment of terminal alkynes with pressurized carbon monoxide, tributyltin hydride (30 mol%) and AIBN in the presence of excessive amines, led to give good yields of α-methylene amides. The generated α-ketenyl radicals then undergo nucleophilic trapping of a carbonyl group by amines leading to the production of 1-hydroxyallyl radicals, 1,4-H migration to give α-keto radicals, and β-elimination to give the tributyltin radical and α-alkyl acrylic amides. All these achievements represent new methods for alkyne carbonylations via α-ketenyl radicals.
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Research Products
(10 results)
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[Journal Article] Generation of ketone dilithio α,β-dianions and their reactions with electrophiles2005
Author(s)
Nakahira, H., Ikebe, M., Oku, Y., Sonoda, N., Fukuyama, T., Ryu, I.
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Journal Title
Tetrahedron 61
Pages: 3383-3392
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Radical carbonylation of 1,5-enynes using TTMSS as a chain carrier. Unexpected Formation of persistent 3-silyl-1-siloxyallyl serving as a chain breaking path2004
Author(s)
Fukuyama, T., Uenoyama, Y., Oguri, S., Otsuka, N., Ryu, I.
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Journal Title
Chem.Lett. 33・(7)
Pages: 854-855
Description
「研究成果報告書概要(和文)」より
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