1-Boc-1H-pyrrolo[3,2-c]pyridine

Step A: To the solution of lH-pyrrolo[3, 2-c]pyridine (LXXIV) (24 g, 203 mmol) and TEA (62 g, 609 mmol) in DCM (200 mL) was added (Boc)To the solution of lH-pyrrolo[3, 2-c]pyridine (LXXIV) (24 g, 203 mmol) and TEA (62 g, 609 mmol) in DCM (200 mL) was added (Boc)To the solution of lH-pyrrolo[3, 2-c]pyridine (XCI) (24 g, 203 mmol) and TEA (62 g, 609 mmol) in DCM (200 mL) was added (Boc)Step 1 [0703] To the solution of lH-pyrrolo[3, 2-c]pyridine (LXXIV) (24 g, 203 mmol) and TEA (62 g, 609 mmol) in DCM (200 mL) was added (Boc)To a solution of 5-azaindole (5.00 g) and EtTo a solution of 5-azaindole (5.00 g) and EtDimethylaminopyridine (DMAP) (2.08 g, 16.9 mmol) in acetonitrile (20 mL) was added drop wise to 5-azaindole (2.0 g, 16.9 mmol) in acetonitrile (70 mL) at room temperature. After stirring for 2 hours, di-ieri-butyldicarbonate (3.68 g, 16.9 mmol) was added in portion at same temperature. After 2.5 hours, the solvent was evaporated under reduced pressure and the residue (5.4 g) was purified by column chromatography (silica gel, ethyl acetate/heptane 1/10 to 1/2) to provide pyrrolo[3, 2-c]pyridine-l- carboxylic acid tert-butyl ester (2.72 g, 92.4percent yield) as a bright yellow oil. To a solution of 4-aminopyridine (1a, 37.65 g, 0.4 mole) in HOAc (200 mL) was added iodine monchloride (130 g, 0.8 mole) portionwise. The reaction mixture was stirred at 45° C. for 20 h, then diluted with water (500 mL). The mixture was cooled to 0° C., and basified 30percent NaOH to pH=9-10. The solution was extracted with EtOAc (1 L.x.2) and the combined extracts were washed with 15percent Na2S2O3 (400 mL.x.2), water, brine, dried over Na2SO4, and evaporated in vacuo to give 1b (62 g) as a light yellow solid. ES-MS m/z 221 (MH+). [0185] Into a pressure flask was added 1b (4.4 g, 20 mmol), cupric iodide (228 mg, 1.2 mmol), (trimethylsilyl)acetylene (7.08 g, 72 mmol), triethylamine (200 mL) and DMF (80 mL). The mixture was stirred under nitrogen for 10 min, followed by addition of Pd(PPh3)2Cl2 (0.84 g, 1.2 mmol). The mixture was then stirred to 70° C. for 5 h, and then diluted with ethyl acetate (600 mL). The solution was washed with H2O (250 mL.x.2), brine (250 mL), dried over Na2SO4, and evaporated in vacuo to give crude product which was purified by flash chromatography (100percent CH2Cl2 to 2percent MeOH in CH2Cl2) to afford Compound 1c (2. 97 g, 78percent) as a light brown solid. 1H NMR (CDCl3) δ 8.37 (s, 1H), 8.13 (d, J=5.7 Hz, 1H), 6.53 (d, J=5.6 Hz, 1H), 4.67 (bs, 2H), 0.27 (s, 9H). ES-MS m/z 191 (MH+). [0186] Into an ice-cold solution of 1c (1.35 g, 7.1 mmol) in THF (50 mL) was added 95percent NaH (1.86 g, 8.5 mmol). The mixture was stirred at 0° C. for 10 min, rt for 10 min, then cooled back to 0° C. (Boc)2O (1.86 g, 8.5 mmol) was added and the mixture was stirred at 0° C. for 30 min and then rt for 2 h. Additional 95percent NaH (0.08 g, 3.5 mmol) and (Boc)2O (0.2 g, 0.92 mmol) were added and the mixture was stirred at rt for another 2 h. The reaction was then quenched slowly with saturated NaHCO3 (10 mL), extracted with ethyl acetate (200 mL.x.2). The organic layer was washed with brine, dried over Na2SO4, and evaporated in vacuo. The crude product was purified by flash chromatography (EtOAc/hexane; 1:3) to give 1d (0.67 g). ES-MS m/z 219 (MH+). [0187] To a solution of 1d (1.3 g, 4.5 mmol) in DMF (20 mL) was added cupric iodide (0.85 g, 4.5 mmol). The mixture was stirred at 80° C. for 6 h and then filtered. The filtrate was extracted with ethyl acetate (100 mL.x.3), and the organic layer was washed with H2O, brine, dried (Na2SO4) and concentrated. The residue was purified by flash chromatography (Ethyl acetate/hexane; 1:3) to give Compound 1e (0.25 g, 26percent). 1H NMR (CDCl3) δ 8.89 (s, 1H), 8.47 (d, J=5.8 Hz, 1H), 7.98 (d, J=5.7 Hz, 1H), 7.62 (d, J=3.7 Hz, 1H), 6.66 (d, J=3.7 Hz, 1H), 1.69 (s, 9H). ES-MS m/z 219 (MH+). [0188] To a solution of 1e (0.178 g, 0.82 mmol) in methylene chloride (5 mL) was added TFA (1.0 mL) slowly. The mixture was stirred at rt for 1.5 h, and The solvent was evaporated to obtain 5-azaindole 1f as a white solid (0.18 g, 95percent). 1H NMR (CDCl3) δ 8.97 (s, 1H), 8.31 (d, J=5.7 Hz, 1H), 7.35 (d, J=5.7 Hz, 1H), 7.29 (m, 1H), 6.68 (d, J=3.3 Hz, 1H). ES-MS m/z 119 (MH+). [0189] A mixture of Compound 1f (0.26 g, 2.2 mmol) and cesium carbonate (1.43 g, 4.4 mmol) in DMF (10 mL) was stirred at rt for 10 min, and then 3-methoxypropylbromide (0.40 g, 2.64 mmol) was added. The reaction mixture was stirred at 60° C. for 3 h. The solvent was evaporated and the residue was partitioned between EtOAc (150 mL) and water (100 mL). The organic layer was washed with water (3.x.50 mL), brine (2.x.50 mL), then dried (Na2SO4) and evaporated in vacuo to give a brown oil. The crude product was purified by flash column chromatography (from 100percent DCM to DCM/MeOH/NH4OH; 97:3:0.3) to afford Compound 1g (0.26 g, 62percent) as light brown oil. 1H NMR (CDCl3) δ 8.91 (s, 1H), 8.31 (d, J=5.8 Hz, 1H), 7.27 (s, 1H), 7.11 (d, J=3.2 Hz, 1H), 6.60 (d, J=3.3 Hz, 1H), 4.25 (t, J=6.7 Hz, 2H), 3.32 (s, 3H), 3.25 (t, J=5.7 Hz, 2H), 2.05 (m, 2H). ES-MS m/z 191(MH+). [0190] Oxalyl chloride (3 mL) was added slowly to a solution of compound 1g (0.22 g, 1.14 mmol) in ether (5 mL). The mixture was heated to 48° C. in a pressure tube overnight. TLC shown that some starting materials were still present. Additional 0.5 mL of oxalyl chloride was added and stirring was continuted at 48° C. for another night. The mixture was then cooled down to rt, to which methanol (3 mL) was added. The mixture was heated to 48° C. and stirred for 2 h. The volatiles removed under vacuo and the residue was purified by flash chromatography (from 100percent DCM to DCM/MeOH/NH4OH; 97:3:0.3) to afford Compound 1h (0.15 g, 48percent) as a white solid. 1H NMR (CDCl3) δ 8.51 (d, J=5.8 Hz, 1H), 8.44 (s, 1H), 7.37 (m, 1H), 4.34 (t, J=6.8 Hz, 2H), 3.97 (s, 3H), 3.35 (s, 3H), 3.30 (t, J=5.7 Hz, 2H), 2.12 (m, 2H). ES-MS m/z 277 (MH+). [0191] The α-ketoester Compound 1h (53.8 mg, 0.20 mmol) and amide Compound 1i (23 mg, 0.14 mmol) were combined in dry THF (3 mL) under argon and cooled with an ice bath as a solution of 1.0 M potassium t-butoxide in THF (1 mL, 1 mmol) was added dropwise. The mixture was stirred at 0° C. for 30 min, then rt for 2 h. The reaction mixture was cooled in an ice bath, and 12 N HCl (4 mL) was added slowly. The mixture was stirred for 20 min and then basified with 3 N NaOH, followed by EtOAc extraction. The organic extracts were combined, washed with brine, dried (Na2SO4) and evaporated in vacuo to a yellow oil, which was purified by flash column chromatography (from 100percent DCM to (DCM/MeOH/NH4OH; 93:7:0.7) to afford Compound 1 (25 mg, 32percent) as an orange-yellow flaky solid. 1H NMR (CDCl3) δ 8.25 (d, J=5.8 Hz, 1H), 8.01 (s, 1H), 7.65 (s, 1H), 7.44 (t, J=8.7 Hz, 1H), 7.39 (d, J=7.6 Hz, 1H), 7.24 (m, 1H), 7.03 (t, J=7.5 Hz, 1H), 6.89 (d, J=8.4 Hz, 1H), 4.32 (t, J=6.7 Hz, 2H), 3.38 (s, 3H), 3.35 (s, 3H), 3.29 (t, J=5.6 Hz, 2H), 2.10 (m, 2H). ES-MS m/z 392 (MH+). HRMS (FAB) Calcd for C22H21N3O4+H+, 392.1629; Found, 392.1610.

Molecular Weight:218.25
XLogP3:2.2
Hydrogen Bond Acceptor Count:3
Rotatable Bond Count:2
Exact Mass:218.105527694
Monoisotopic Mass:218.105527694
Topological Polar Surface Area:44.1
Heavy Atom Count:16
Complexity:273
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes