Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 141, Issue 10, Pages 4219-4224Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b00302
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Funding
- Research Grants Council of The Hong Kong Special Administration Region [14305017, 14305018, 14305918]
- Incentive Fund from Faculty of Science, CUHK
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A proof-of-concept example of catalytic regioselective cage B(8)-H functionalization of o-carboranes has been disclosed for the first time. Under the help of an acylamino directing group at cage B(3), a series of B(8)-arylated, B(4,7,8)-triarylated and B(4,7,8)-trifluorinated o-carborane derivatives were conveniently prepared. On the basis of isolation of a key intermediate, deuterium labeling experiments and DFT calculations, a reaction mechanism involving a high-valent palladium induced cage-walking from B(4) to B(8) vertex is proposed to account for the regioselective B(8)-H activation.
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