78% |
With sulfuric acid; In tetrahydrofuran; at 50℃; for 2.0h;Inert atmosphere; |
(001011 To an inerted 1 L jacket reactor, equipped with a mechanic stirrer, a nitrogen/vacuum manifold, a thermocouple, and a condenser, were charged (R)-5-bromo-4- (3 -(tert-butoxycarbonylamino)piperidin- 1 -yl)-3-nitro- 1 H-pyrrolo [2,3 -bjpyridine (1:1 toluene solvate) (30.0 g, 1.00 equiv), tetrahydrofuran (180 mL, 6.00 mL/g), followed by 4.5 M sulfuric acid (36.1 mE, 3.00 equiv). The reaction mixture was stirred at 50 ± 5 c for 2 h and then cooled to 20 c. An aqueous piperazine solution (42.4 g dissolved in 190 mL of water) was added slowly at 25 c followed by addition of 15.0 mE of sat?d brine. The aqueous bottom layer was removed. The resulting solution was stirred at 20 c for 5 mm. Water (22.0 mL) was added. continuous distillation was conducted at 50 c by adjusting the feed rate of ethanol to match the distillation rate until a total of 260 mE of ethanol was added. Water (340 mE) was added at 50 c over 1 h. The resulting solid was isolated by filtration, washed with20% ethanol in water (2 x 60 mL) and dried in a vacuum oven at 50 C overnight to give 16.4g (78% corrected yield) of (R)-5-bromo-4-(3 -amino)piperidin- l-yl)-3-(cyclopropanecarboxamido)- 1 H-pyrrolo[2,3-b]pyridine as a light yellow solid. (Note: The proton (?H) and carbon-13 (?3C) spectra of freebase product are very broad. Therefore, the spectra shown below are of freebase converted to a bis-HC1 salt.) ?H NMR (300 MHz,DMSO-d6): 11.98 (br, 1H), 9.78 (s, 1H), 8.44 (br, 3H), 8.25 (s, 1H), 7.45 (d, J 2.4 Hz, 1H), 3.57 (m, 1H), 3.43 (m, 1H), 3.41 (m, 11-1), 3.28 (m, 1H), 3.14 (m, 111), 2.15 (m, 111),1.90 (penta, J= 6.5 Hz, 1H), 1.81 (m, 1H), 1.72 (m, 1H), 1.52 (m, 1H), 0.83 (m, 4H). ?3C NMR (75 MHz, DMSO-d6): 172.9, 149.5, 145.9, 145.1, 121.9, 114.2, 113.1, 107.8, 53.8, 51.1, 47.5, 28.6, 24.37, 14.7, 7.55, 7.45. HRMS-ESI (m/z): [M + H] calcd for C16H21BrN5O, 378.0924; found, 378.0912. |
16.4 g |
With sulfuric acid; water; In tetrahydrofuran; at 45 - 55℃; for 2.0h; |
Step 4: Preparation of (i?)-5-bromo-4-(3-amino)piperidin-l-yl)-3- (cyclopropanecarboxamido)- 1 H-pyrrolo [2,3 -6]pyridine : [00101] To an inerted 1 L jacket reactor, equipped with a mechanic stirrer, a nitrogen/vacuum manifold, a thermocouple, and a condenser, were charged (i?)-5-bromo-4- (3-(tert-butoxycarbonylamino)piperidin-l-yl)-3-nitro-lH-pyrrolo[2,3-0]pyridine (1 : 1 toluene solvate) (30.0 g, 1.00 equiv), tetrahydrofuran (180 mL, 6.00 mL/g), followed by 4.5 M sulfuric acid (36.1 mL, 3.00 equiv). The reaction mixture was stirred at 50 ± 5 C for 2 h and then cooled to 20 C. An aqueous piperazine solution (42.4 g dissolved in 190 mL of water) was added slowly at 25 C followed by addition of 15.0 mL of sat'd brine. The aqueous bottom layer was removed. The resulting solution was stirred at 20 C for 5 min. Water (22.0 mL) was added. Continuous distillation was conducted at 50 C by adjusting the feed rate of ethanol to match the distillation rate until a total of 260 mL of ethanol was added. Water (340 mL) was added at 50 C over 1 h. The resulting solid was isolated by filtration, washed with 20% ethanol in water (2 x 60 mL) and dried in a vacuum oven at 50 C overnight to give 16.4 g (78% corrected yield) of (i?)-5-bromo-4-(3-amino)piperidin-l-yl)-3- (cyclopropanecarboxamido)-l H-pyrrolo [2,3 -b]pyridine as a light yellow solid. (Note: The proton ( H) and carbon- 13 ( C) spectra of freebase product are very broad. Therefore, the spectra shown below are of freebase converted to a bis-HCl salt.) 1H NMR (300 MHz, DMSC ): delta 11.98 (br, 1H), 9.78 (s, 1H), 8.44 (br, 3H), 8.25 (s, 1H), 7.45 (d, J = 2.4 Hz, 1H), 3.57 (m, 1H), 3.43 (m, 1H), 3.41 (m, 1H), 3.28 (m, 1H), 3.14 (m, 1H), 2.15 (m, 1H), 1.90 (penta, J = 6.5 Hz, 1H), 1.81 (m, 1H), 1.72 (m, 1H), 1.52 (m, 1H), 0.83 (m, 4H). 13C NMR (75 MHz, DMSO- 6): 5 172.9, 149.5, 145.9, 145.1, 121.9, 114.2, 113.1, 107.8, 53.8, 51.1, 47.5, 28.6, 24.37, 14.7, 7.55, 7.45. HRMS-ESI (m/z): [M + H]+ calcd for C16H21BrN50, 378.0924; found, 378.0912. |