A vessel was charged with 53 (665 mg, 2.82 mmol), 1-(1H-indol-5-yl)ethanamine adipic acid salt (1.45 g mg, 6.20 mmol, CASRN 1282097-87-3), DIPEA (7.4 mL) and n-BuOH (57 mL), sealed and heated at 120° C. for 12 d. The reaction mixture was cooled and diluted with EtOAc. The organic layer was washed sequentially with water and brine, dried (Na2SO4), filtered and concentrated in vacuo. The crude was purified by reverse-phase HPLC purification to afford 250.0 mg (24.7%) of racemic N2-(1-(1H-indol-5-yl)ethyl)-N4-(5-cyclopropyl-1H-pyrazol-3-yl)pyrimidine-2,4-diamine (180) as a white solid.
