Reference of 136927-64-5, These common heterocyclic compound, 136927-64-5, name is 1-Chloropyrrolo[1,2-a]pyrazine, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
To a solution of the product of Example 4 A in dioxane (lmL) were added 1- chloropyrrolo[l,2-a]pyrazine (64.3 mg, 0.421 mmol), palladium(II) acetate (7.89 mg, 0.035 mmol), xantphos (20.3 mg, 0.035 mmol), and potassium carbonate (146 mg, 1.05 mmol). The reaction mixture was heated at 80 C for 18 hours. The reaction mixture was concentrated under reduced pressure, and the residue was purified with flash column chromatography (Si(, heptane:ethyl acetate 0-100%) followed by preparative HPLC [Waters XBridge C18 5 mupiiota OBD column, 30 x 100 mm, flow rate 40 mL/minute, 5-100% gradient of acetonitrile in buffer (0.1 % trifluoroacetic acid)] to give the title compound (8 mg, 0.020 mmol, 6% yield). JH NMR (400 MHz, DMSO-<) delta ppm 8.92 (s, 1H), 7.88 (d, J = 5.7 Hz, 1H), 7.86 - 7.82 (m, 1H), 7.52 (d, J = 4.3 Hz, 1H), 7.47 (t, J = 8.8 Hz, 1H), 7.05 (dd, J = 11.3, 2.9 Hz, 1H), 7.00 (d, J = 5.7 Hz, 1H), 6.87 - 6.81 (m, 2H), 4.51 (s, 2H), 2.57 (s, 6H); MS (ESI+) m/z 401 (M+H)+.
Statistics shows that 1-Chloropyrrolo[1,2-a]pyrazine is playing an increasingly important role. we look forward to future research findings about 136927-64-5.
Reference:
Patent; CALICO LIFE SCIENCES LLC; ABBVIE INC.; MARTIN, Kathleen, Ann; SIDRAUSKI, Carmela; FROST, Jennifer, M.; PLIUSHCHEV, Marina, A.; TONG, Yunsong; BLACK, Lawrence, A.; XU, Xiangdong; SHI, Lei; ZHANG, Qingwei, I.; CHUNG, Seungwon; SWEIS, Ramzi, Farah; DART, Michael, J.; RANDOLPH, John, T.; MURAUSKI, Kathleen; (674 pag.)WO2019/90076; (2019); A1;,
Pyrazine – Wikipedia,
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