期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 50, 页码 15609-15614出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201607867
关键词
alkenylation; B-H activation; boron clusters; dodecaborates; rhodium catalysis
资金
- Natural Science Foundation of China [107305-N11412]
- National Basic Research Program of China (973 Project) [2015CB856500]
- Chinese 1000 Young Talents Plan
1,2,3-Trisubstituted closo-dodecaborates with B-O, B-N, and B-C bonds as well as a fused borane oxazole ring have been synthesized by rhodium-catalyzed direct cage B-H alkenylation and annulation of ureido boranes in the first reported example of regioselective B-H bond functionalization of the [B12H12](2-) cage by transition-metal catalysis. This reaction proceeded at room temperature under ambient conditions and exhibited excellent selectivity for efficient monoalkenylation with good functional-group tolerance. The urea moiety enabled B-H activation by acting as a directing group, was incorporated in the oxazole ring in situ, and also avoided multiple alkenylation. A possible mechanism is proposed on the basis of the isolation of a rhodium agostic intermediate and control experiments.
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