A palladium-catalyzed sequential B(3)-I and B(4)-H bond activation has been achieved for the synthesis of 3,4-benzo-o-carboranes via a formal [2 + 2 + 2] cycloaddition of 3-I-o-carborane with 2 equiv. of arylalkynes. This represents a new protocol to construct o-carborane-fused cyclics in one process, in which the Pd fragment migrates formally from the B(3) to B(4) position of the cage.
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| http://dx.doi.org/10.1039/d0dt03740k | DOI Listing |
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