Mar, 2008
Difluoro-lambda(3)-bromane-induced oxidative carbon-carbon bond-forming reactions: Ethanol as an electrophilic partner and alkynes as nucleophiles
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
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- Volume
- 130
- Number
- 12
- First page
- 3742
- Last page
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- Language
- English
- Publishing type
- DOI
- 10.1021/ja801097c
- Publisher
- AMER CHEMICAL SOC
Reported here for the first time are the oxidative couplings of alkynes and primary alcohols yielding conjugated enones. Although the BF(3)-catalyzed reaction of terminal alkynes with p-trifluoromethophenl(difluoro)-lambda(3)-bromane results in the fluoro-lambda(3)-bromanation of triple bonds to afford (E)-beta-fluorovinyl-lambda(3)-bromanes, reaction of an alkyne with the difluoro-lambda(3)-bromane in the presence of an alcohol and BF(3)-Et(2)O affords directly conjugated enones in good yields. The reaction proceeds in a highly stereo- and regioselective manner under metal-free conditions. Interestingly, no formation of enones was detected, when difluoro-lambda(3)-iodane p-CF(3)C(6)H(4)IF(2) Was used instead of the lambda(3)-bromane. A mechanism involving a lambda(3)-bromane-induced oxidation of an alcohol to an aldehyde, [2 + 2] cyclization with alkynes yielding 2H-oxetes, and finally the electrocyclic ring opening is discussed.
- Link information
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- DOI
- https://doi.org/10.1021/ja801097c
- CiNii Articles
- http://ci.nii.ac.jp/naid/80019463803
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/18303895
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000254173600019&DestApp=WOS_CPL
- ID information
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- DOI : 10.1021/ja801097c
- ISSN : 0002-7863
- CiNii Articles ID : 80019463803
- Pubmed ID : 18303895
- Web of Science ID : WOS:000254173600019