Platinum(0)-Catalyzed Indolyne Insertion into Bis(pinacolato)diboron Followed by Site-Selective Suzuki–Miyaura Cross-Coupling

Indolynes are converted into previously
unprecedented indole building
blocks by platinum(0)-catalyzed insertion into a symmetrically substituted
boron–boron bond. The two boron sites in these indoles must
be differentiated in a subsequent step, and the 6,7-bis­[(pinacolato)­boryl]­indole
was shown to undergo site-selective Suzuki–Miyaura cross-coupling
with perfect C7 selectivity. The net reaction is the regioselective
installation of two different substituents in the C6 and C7 positions
of a 6,7-indolyne precursor.