Development of an Efficient Manufacturing Process for Reversible Bruton’s Tyrosine Kinase Inhibitor GDC-0853

Efforts toward the process development of reversible Bruton's tyrosine kinase (BTK) inhibitor GDC-0853 (1) are described. A practical synthesis of GDC-0853 was accomplished via a key highly regioselective Pd-catalyzed C–N coupling of tricyclic lactam 5 with 2,4-dichloronicotinaldehyde (6) to afford the C–N coupling product 3, a Suzuki–Miyaura cross-coupling of intermediate 3 with boronic ester 4 derived from a Pd-catalyzed borylation of tetracyclic bromide 7, to generate penultimate aldehyde intermediate 2 and subsequent aldehyde reduction and recrystallization. Process development of starting materials 5, 6, and 7 is also discussed.