Journal
ORGANIC LETTERS
Volume 17, Issue 3, Pages 508-511Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol503521b
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Funding
- NIH [GM-087605]
- NSF [CHE1213230]
- China Scholarship Council [201306350101]
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The first regioselective oxidative coupling of 2-hydroxycarbazoles is described. With a vanadium catalyst and oxygen as the terminal oxidant, dimers with an ortho-ortho' coupling pattern were obtained with high selectivity. Further oxidation led to ortho'-ortho' coupling to generate a tetramer, which provided insight that the atropisomerization barriers of the unsymmetrical biaryl bonds are much lower than expected.
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