Reaction Steps
170 a) 2-[(2-Chloro-[1,2,4]triazolo[1,5-a]pyridin-8-ylamino)-methyl]-pyrrolidine-1-carboxylic acid tert-butyl ester was prepared from 8-bromo-2-chloro-[1,2,4]triazolo[1,5-a]pyridine (500.0 mg, 2.151 mmol) and 2-aminomethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (475.0 mg, 2.372 mmol) in a manner analogous to Example 2d. Product isolated as a yellow viscous oil (0.411 g, 54%). MS=374, 376 (MH)+. 170 b) 2-({2-[4-(4-Methyl-piperazin-1-yl)-phenylamino]-[1,2,4]triazolo[1,5-a]pyridin-8-ylamino}-methyl)-pyrrolidine-1-carboxylic acid tert-butyl ester was prepared from 2-[(2-chloro-[1,2,4]triazolo[1,5-a]pyridin-8-ylamino)-methyl]-pyrrolidine-1-carboxylic acid tert-butyl ester (400.0 mg, 1.137 mmol) and 4-(4-methyl-piperazin-1-yl)-phenylamine (240.0 mg, 1.255 mmol) with 2,2′-bis-dicyclohexylphosphanyl-biphenyl (63.0 mg, 0.115 mmol) as the ligand in a manner analogous to Example 2d. Product isolated as a tan resin (0.090 g, 16%). 1H NMR (400 MHz, CDCl3, δ, ppm): 7.81-7.74 (m, 1H), 7.47 (d, J=7.6 Hz, 2H), 6.95 (dm J=8.8 Hz, 2H), 6.74-6.45 (m, 3H), 5.40-4.90 (m, 1H), 4.23-4.06 (m, 1H), 3.56-3.05 (m, 8H), 2.63-2.57 (m, 4H), 2.36 (s, 3H), 2.05-1.80 (m, 4H), 1.56-1.44 (m, 9H). MS=507 (MH)+. 170 c) To a solution of 2-({2-[4-(4-Methyl-piperazin-1-yl)-phenylamino]-[1,2,4]triazolo[1,5-a]pyridin-8-ylamino}-methyl)-pyrrolidine-1-carboxylic acid tert-butyl ester (90.0 mg, 0.178 mmol) in dichloromethane (1 mL) was added trifluoroacetic acid (0.0547 mL, 0.710 mmol). The mixture was stirred at room temperature for 18 hours then the volatiles were evaporated under reduced pressure. Crude N(2)-[4-(4-Methyl-piperazin-1-yl)-phenyl]-N(8)-pyrrolidin-2-ylmethyl-[1,2,4]triazolo[1,5-a]pyridine-2,8-diamine as the bis-trifluoroacetic acid salt was isolated as a red-brown resin. The residue was suspended in dichloromethane (2 mL) and triethylamine (0.148 mL, 1.06 mmol) was added. The mixture was cooled to 5° C. and methanesulfonyl chloride (0.0165 mL, 0.213 mmol) was added. The mixture was stirred for 1 hour at 5° C. then warmed to room temperature and stirred for 1 hour. The reaction mixture was poured into saturated aqueous sodium carbonate (10 mL) and extracted with dichloromethane (3×10 mL). The combined organic layers were washed with water (10 mL) then saturated aqueous sodium chloride (10 mL), dried over magnesium sulfate, filtered and evaporated to a dark resin. The residue was purified via reverse phase chromatography using a Gilson apparatus (0%→50% acetonitrile:water (w/0.1% TFA modifier)). Collected desired fractions, basified with saturated aqueous sodium carbonate and extracted with dichloromethane (3×10 mL). The combined organic layers were dried over magnesium sulfate, filtered and evaporated. N(8)-(1-Methanesulfonyl-pyrrolidin-2-ylmethyl)-N(2)-[4-(4-methyl-piperazin-1-yl)-phenyl]-[1,2,4]triazolo[1,5-a]pyridine-2,8-diamine was isolated as a pale yellow foam (0.033 g, 38%). 1H NMR (400 MHz, CDCl3, δ, ppm): 7.80 (d, J=6.5 Hz, 1H), 7.47 (d, J=8.8 Hz, 2H), 6.96 (d, J=8.9 Hz, 2H), 6.71 (t, J=7.4 Hz, 1H), 6.55 (d, J=7.9 Hz, 1H), 6.52 (s, 1H), 5.09 (t, J=6.4 Hz, 1H), 4.03-3.94 (m, 1H), 3.63-3.55 (m, 1H), 3.53-3.46 (m, 1H), 3.39-3.25 (m, 2H), 3.18-3.13 (m, 4H), 2.88 (s, 3H), 2.62-2.57 (m, 4H), 2.36 (s, 3H), 2.11-1.91 (m, 4H). MS=485 (MH)+.
