期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 11, 页码 4257-4261出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201406595
关键词
alkyl halides; alkynes; carboboration; diboration; iron
资金
- Japan Society for the Promotion of Science (JSPS)
- Council for Science and Technology Policy (CSTP)
- Japan Science and Technology Agency (JST)
- Core Research for Evolutional Science and Technology program (CREST) [1102545]
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
An iron-catalyzed diboration reaction of alkynes with bis(pinacolato)diboron (B(2)pin(2)) and external borating agents (MeOB(OR)(2)) affords diverse symmetrical or unsymmetrical cis-1,2-diborylalkenes. The simple protocol for the diboration reaction can be extended to the iron-catalyzed carboboration of alkynes with primary and, unprecedentedly, secondary alkyl halides, affording various tetrasubstituted monoborylalkenes in a highly stereoselective manner. DFT calculations indicate that a boryliron intermediate adds across the triple bond of an alkyne to afford an alkenyliron intermediate, which can react with the external trapping agents, borates and alkyl halides. In situ trapping experiments support the intermediacy of the alkenyl iron species using radical probe stubstrates.
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