期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 133, 期 47, 页码 19076-19079出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja209205x
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资金
- NIH/NIGMS [GM-073949]
- NSF
A strategy for the construction of unsymmetrical cyclobutanes using C-H functionalization logic is demonstrated in the total synthesis of piperarborenine B and piperarborenine D (reported structure). These syntheses feature a new preparation of cis-cyclobutane dicarboxylates from commercially available coumalate starting materials and a divergent approach to the controlled cis or trans installation of the two distinct aryl rings found in the natural products using the first example of cyclobutane C H arylation. The structure of piperarborenine D is reassigned to a head-to-head dimer, which was synthesized using an intramolecular [2+2] photocycloaddition strategy.
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