Triethylamine → HCID 67120320, compound

Temperature

80 °C

A 150 mL tube was charged with 5-methyl-4-phenoxy-pyrrolo[2,1-f][1,2,4]triazin-6-ol (5.93 g, 24.6 mmol), THF (2 mL) and sodium methanethiol (5.17 mg, 73.7 mmol). The tube was sealed and the mixture was heated at 80° C. for 4 h. The mixture was cooled to RT, water was added (100 mL) and the solution was extracted with ethyl acetate (3×100 mL). Combined organic layers were washed with water (200 mL), 1N aqueous solution of sodium hydroxide (2×200 mL), brine (200 mL), dried and concentrated in vacuo to afford (3.2 g, 67%) of 5-methyl-4-methylsulfanylpyrrolo[2,1-f][1,2,4]triazin-6-ol as an beige solid. 1H NMR (400 MHz, DMSO-d6) δ 9.49 (1H, s), 8.11 (1H, s), 7.39 (1H, s), 2.58 (3H, s), 2.34 (1H, s). m/z 196 (M+H+). B. A 10 mL tube was charged with 5-methyl-4-methylsulfanylpyrrolo[2,1-f][1,2,4]triazin-6-ol (75 mg, 0.38 mmol), tert-butylalcohol (2 mL), (S)-propylene oxide (0.134 mL, 1.92 mmol) and triethylamine (5 μL, 0.04 mmol). The tube was sealed and the mixture was heated at 80° C. for 17 h. The mixture was cooled to RT and concentrated in vacuo. The crude material was purified by flash chromatography eluting a mixture of 50% ethyl acetate in hexane to give (56 mg, 58%) of (S)-1-(5-methyl-4-methylsulfanylpyrrolo[2,1-f][1,2,4]triazin-6-yloxy)-propan-2-ol as an white solid. 1H NMR (400 MHz, DMSO-d6) δ 8.16 (1H, s), 7.78 (1H, s), 4.88 (1H, m), 3.95 (m, 1H), 3.82 (2H, m), 2.59 (3H, s), 2.36 (3H, s), 1.13 (3H, d, J=6.3 Hz). m/z 254 (M+H+). C. To a solution of (S)-5-methyl-4-methylsulfanyl-pyrrolo[2,1-f][1,2,4]triazin-6-ol (20 mg, 0.08 mmol) in chloroform (1.0 mL) at 0° C., was added a solution of peracetic acid in acetic acid (51 μL, 0.24 mmol, 32% wt solution). The mixture was allowed to reach RT and stirred for an additional 2.0 h. A saturated solution of ammonium chloride was added and the layers were separated. The aqueous layer was extracted with ethyl acetate (2×50 mL), the organic layers were combined, washed with water (100 mL), brine (100 mL), dried and concentrated in vacuo. The resulting sulfone was used without any purification. D. At −78° C., sodium hydride (60% in oil, 3.1 mg, 0.08 mmol) was added to a solution of 4-fluoro-1H-pyrrolo[2,3-b]pyridin-5-ol (13 mg, 0.09 mmol, see Example 4) in dimethyl formamide (1 mL). The mixture was stirred at 0° C. for 30 min. and cooled back down to −78° C. (S)-1-(4-methanesulfonyl-5-methylpyrrolo[2,1-f][1,2,4]triazin-6-yloxy)-propan-2-ol (22 mg, 0.08 mmol) was then added and the mixture was stirred at RT for 2 h, quenched with saturated ammonium chloride (20 mL) and extracted with ethyl acetate (3×25 mL). The combined organic layers were washed with brine (50 mL), dried (MgSO4), filtered and evaporated. The residue was purified by preparative HPLC to yield (10 mg, 36%) of the title compound. 1H NMR (400 MHz, DMSO-d6) δ 12.17 (1H, s), 8.31 (1H, d, J=9.3 Hz), 7.95 (1H, s), 7.93 (1H, s), 7.61 (1H, t, J=3.1 Hz), 6.59 (1H, dd, J=1.98, 3.3 Hz), 4.01-3.97 (1H, m), 3.92-3.83 (2H, m), 2.42 (3H, s), 1.16 (3H, d, J=6.3 Hz). m/z 358 (M+H+).

1. customThe tube was sealed
2. temperatureThe mixture was cooled to RT
3. concentrationconcentrated in vacuo
4. customThe crude material was purified by flash chromatography
5. washeluting
6. additiona mixture of 50% ethyl acetate in hexane

ORD record

ord-da4e4cba081749a29aca5554b91c569b

Source dataset

uspto-grants-2005_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06969717B2