New discoveries in chemical research and development in 2021. Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. 7343-33-1, name is 5-Bromo-1H-1,2,4-triazole belongs to triazoles compound, it is a common compound, a new synthetic route is introduced below. 7343-33-1
[004581 Combined 3 -bromo- 1 H-i ,2,4-triazole (29.6 g, 200 mmol), 1,2 ,4-trifluorobenzene(79.3 g, 62.70 mL, 600.0 mmol) and potassium carbonate (27.6 g, 200.0 mmol) in 500mL of DMF and heated to i000ii00 for 22 hours. The mixture was cooled and DMF removed under vacuum to dryness. 250 mL of water was added and the organics extracted with EtOAc. The organic layer was dried over sodium sulfate, filtered and evaporated. The crude mixture was purified on silica gel (220 grams column, 10-50percent Ethyl acetate:Hexanes) to afford 13g (25percent) of product JW-4c as off white solid. ?H NMR (300 MHz, DMSO-d6) oe 9.10 (d, J = 2.0 Hz, 1H), 7.77 (ddd, J = 8.9, 5.9, 3.2 Hz, 1H), 7.65 (ddd, J = 10.4, 9.3, 4.8 Hz, 1H), 7.52 – 7.41 (m, 1H) ppm. ESI-MS m/z calc. 258.95566, found 260.01 (M+i)+; Retention time: 0.79 minutes.
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Reference:
Patent; VERTEX PHARMACEUTICALS INCORPORATED; DAVIES, Robert, J.; CAO, Jingrong; COCKERILL, Meghan, Elise; COLLIER, Philip, Noel; DENINNO, Michael, Paul; DOYLE, Elisabeth; FRANTZ, James, Daniel; GAO, Huai; GOLDMAN, Brian, Anthony; GREY, Ronald, Lee; GRILLOT, Anne-laure; GU, Wenxin; HENDERSON, James, A.; IRARRAZAVAL, Raul Eduardo, Krauss; KOLPAK, Adrianne, Lynn; LIAO, Yusheng; MAGAVI, Sanjay Shivayogi; MALTAIS, Francois; MESSERSMITH, David; PIERCE, Albert, Charles; PEROLA, Emanuele; RYU, Elizabeth Jin-Sun; SYKEN, Joshua; WANG, Jian; (706 pag.)WO2016/197009; (2016); A1;,
1,2,3-Triazole – Wikipedia,
Triazoles – an overview | ScienceDirect Topics