Synthesis of 3,6-diaryl-1 H -pyrazolo[3,4- b ]pyridines via one-pot sequential Suzuki-Miyaura coupling.

A practical synthesis of diarylpyrazolo[3,4- b ]pyridine derivatives by a combination of chemoselective Suzuki-Miyaura cross-coupling reactions was developed. The sequential arylation strategy can be performed in a one-pot manner without much loss of efficiency when compared to the corresponding stepwise synthesis. These conditions are applicable to the coupling of a wide variety of aryl and heteroaryl-boronic acids with pyrazolo[3,4- b ]pyridines with high selectivity of the C3 over the C6 position, thus enabling the rapid construction of a diverse array of medicinally important diarylpyrazolo[3,4- b ]pyridines.