Journal
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
Volume 7, Issue -, Pages 1249-1254Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.7.145
Keywords
benzylic metalation; LiNK chemistry; [2.2]metacyclophane; oxidative coupling; planar chirality
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Funding
- Science Foundation Ireland
- Irish Research Council for Science, Engineering and Technology
- ERA-Chemistry
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A new two-step general approach to [2.2]metacyclophane synthesis from substituted m-xylenes is described. The strategy employs a selective benzylic metalation and oxidative C-C bond formation for both synthetic operations. Regioselective benzylic metalation is achieved using the BuLi, KOt-Bu, TMP(H) (2,2,6,6-tetramethylpiperidine) combination (LiNK metalation conditions) and oxidative coupling with 1,2-dibromoethane. The synthetic ease of this approach compares favourably with previously reported methods and allows for ready access to potentially useful planar chiral derivatives.
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