A direct B(4)–H monoacyloxylation
via a Pd-catalyzed regioselective
B(4)–H activation of o-carborane acids with
phenyliodonium dicarboxylates was developed, and a series of B(4)–H
monoacyloxylated o-carboranes decorated with active
groups were synthesized with moderate to good yields as well as excellent
selectivity. In addition, a direct B(4,5)–H diacetoxylation
from o-carborane acids with phenyliodonium diacetate
was demonstrated.
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