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With hydrogenchloride; In potassium tert-butylate; water;
Step 3. tert-butyl 4-(2-(4-(7-(4-amino-2-fluorophenoxy)thieno[3,2-b]pyridin-2-yl)-1H-imidazol-1-yl)ethyl)piperazine-1-carboxylate (306) To a stirred solution of 4-amino-2-fluorophenol x HCl (1.64 g, 10.05 mmol) in NMP (30 mL) was added t-BuOK (2.25 g, 20.1 mmol). After 30 min, compound 305 (3.75 g, 8.37 mmol) was added and the reaction mixture was heated at 100 C. for 1 h. A solution of 4-amino-2-fluorophenol HCl (1.64 g, 10.05 mmol) in NMP (30 mL) in a separate flask was treated with t-BuOK (2.25 g, 20.1 mmol) and the resultant phenolate solution was added to the reaction mixture at 100 C. After 30 min, the reaction was quenched by addition of water and the precipitate was collected by filtration, dried and triturated with MTBE to afford the title compound 306 (2.10 g, 3.90 mmol, 47% yield) as a beige solid. MS (m/z): 539.39 (M+H).
With potassium tert-butylate; In dimethyl sulfoxide;
Step 3: 3-fluoro-4-(2-(5-(2-morpholinoethyl)pyridin-2-yl)thieno[3,2-b]pyridin-7-yloxy)aniline (5) To a solution of <strong>[1341216-35-0]4-amino-2-fluorophenol hydrochloride</strong> (0.792 g, 4.84 mmol) in DMSO (50 mL) was added potassium tert-butoxide (1.05 g, 9.31 mmol), and the dark mixture was stirred for 30 min. Then compound 176 (1.34 g, 3.72 mmol) in DMSO (25 mL) was added, and the resultant mixture was heated to 140 C. for 1 h. The reaction mixture was poured into water, which was then extracted with ethyl acetate. The organic phase was washed with water and brine, dried over anhydrous MgSO4, filtered and concentrated. Flash column chromatography of the residue (eluent 10% methanol/chloroform) afforded title compound 177 (0.15 g, 9% yield). LRMS (M+H): 451.5
With ammonium hydroxide; potassium tert-butylate; In water; 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran;
Step 4. tert-butyl 2-(4-(7-(4-amino-2-fluorophenoxy)thieno[3,2-b]pyridin-2-yl)-1H-imidazol-1-yl)ethyl(2-methoxyethyl)carbamate (251) To a stirred solution of <strong>[1341216-35-0]4-amino-2-fluorophenol hydrochloride</strong> (1.96 g, 11.96 mmol) in NMP (15 mL) was added t-BuOK (2.93 g, 26.1 mmol). After 30 min, chloride 250 (4.75 g, 10.87 mmol) was added and the reaction mixture was heated at 100 C. for 2 h. In a separate flask a solution of 4-amino-2-fluorophenol HCl (1.96 g, 11.96 mmol) in NMP (15 mL) was treated with t-BuOK (2.93 g, 26.1 mmol) and the resultant phenolate solution was added to the original reaction mixture at 100 C. After 30 min, the reaction was quenched by addition of water and the mixture was extracted with DCM. The organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated. The residue was purified by Biotage (SNAP 80 g cartridge; 2% of ammonium hydroxide in MeOH/DCM: 0/100 to 10/90 over 20 CV), to afford the title compound 251 (1.2 g, 2.27 mmol, 21% yield) as light brown solid. MS (m/z): 528.64 (M+H).
With potassium tert-butylate; In dimethyl sulfoxide;
Step 3. 4-(2-(6-(1,3-dioxan-2-yl)pyridin-3-yl)thieno[3,2-b]pyridin-7-yloxy)-3-fluoroaniline (280) To a stirred solution of <strong>[1341216-35-0]4-amino-2-fluorophenol hydrochloride</strong> (5.79 g, 35.4 mmol) in DMSO (40 mL) was added t-BuOK (8.66 g, 77.0 mmol). After 30 min, chloride 279 (10.70 g, 32.2 mmol) was added and the reaction mixture was heated at 100 C. for 1.5 h. More solution of 4-amino-2-fluorophenol HCl (860 mg, 7.70 mmol) and t-BuOK (0.86 g, 7.70 mmol) in DMSO (4 mL) was added to the reaction mixture that was heated at 100 C. for an additional 15 min. The reaction mixture was then poured into water (300 mL) to form a precipitate that was collected by filtration, dried under vacuum and triturated with MTBE to afford the title compound 280 (12.39 g, 29.3 mmol, 91% yield) as a beige solid. MS (m/z): 424.39 (M+H).
Step 4. tert-butyl 2-(6-(7-(4-amino-2-fluorophenoxy)thieno[3,2-b]pyridin-2-yl)pyridin-3-yl)ethyl(2-methoxyethyl)carbamate (181, scheme 44) To a stirred solution of 4-amino-2-fluorophenol HCl (2.01 g, 12.32 mmol) in NMP (13 mL) was added t-BuOK (3.0 g, 26.7 mmol). After 30 min, chloride 286 (4.6 g, 10.27 mmol) was added and the reaction mixture was heated at 100 C. for 1.5 h. The reaction mixture was poured into water (100 mL) to form a precipitate that was collected by filtration, dried and triturated with MTBE, to afford the title compound 181 (2.98 g, 5.53 mmol, 54% yield) as a beige solid. MS (m/z): 538.8 (M+H).
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