Utilizing Native Directing Groups: Synthesis of a Selective IKur Inhibitor, BMS-919373, via a Regioselective C-H Arylation.

BMS-919373 is a highly functionalized quinazoline under investigation as a selective, potent IKur current blocker. By utilizing the aminomethylpyridine side chain at C-4, a selective C-H functionalization at C-5 was invented, enabling the efficient synthesis of this molecule. The strategy of leveraging this inherent directing group allowed the synthesis of this complex heterocycle in only six steps from commodity chemicals. The scope of the C-H activation was further investigated, and the generality of the transformation across a series of bicyclic aromatic heterocycles was explored.