Each compound has different characteristics, and only by selecting the characteristics of the compound suitable for a specific situation can the compound be applied on a large scale. 100189-84-2, name is 2,5-Dibromo-1,3-dimethylbenzene, This compound has unique chemical properties. The synthetic route is as follows., name: 2,5-Dibromo-1,3-dimethylbenzene
Step 2: synthesis of (E)-3-(4-bromo-3,5-dimethylphenyl)acrylonitrile (compound lb) Compound lb [0250] To a solution of 2,5-dibromo-l ,3-dimethylbenzene (2640 mg, 10 mmol, Oakwood Products, Inc. – 018507) in anhydrous acetonitrile (25 mL) was added palladium(II) acetate (1 12 mg, 0.5 mmol), acrylonitrile (531 mg, 10 mmol), tri(o-tolyl)phosphine (131 mg, 0.5 mmol) and triethylamine (4 mL, 30 mmol) then the mixture was purged with argon and heated at 1 10 C for 2 hours. The reaction mixture was filtered through Celite and the filter pad was washed with tetrahydrofuran (10 mL). The filtrate was evaporated then re-dissolved with ethyl acetate (50 mL). The solution was washed with water (50 mL). The water layer was back extracted with ethyl acetate (50 mL). The combined organics were washed with brine (30 mL), dried over sodium sulfate, filtered and concentrated under reduced pressure to give a crude residue. This was subjected to silica gel chromatography (gradient from 0-20% ethyl acetate in wo-hexanes) to afford the crude product which was treated in sonic bath with hexane (10 mL) for 10 minutes. The product precipitated out of solution and was collected by filtration. The solids were washed with cold hexane to afford compound lb. NMR (400 MHz, CDC13) 6 7.25 (d, J= 16.6 Hz, 1H), 7.12 (s, 2H), 5.84 (d, J = 16.6 Hz, 1H), 2.42 (s, 6H). LCMS (m/z) no MS signal, Tr = 2.78 min (LCMS method 2).
According to the analysis of related databases, 100189-84-2, the application of this compound in the production field has become more and more popular.
Reference:
Patent; GILEAD SCIENCES, INC.; INSTITUTE OF ORGANIC CHEMISTRY AND BIOCHEMISTRY OF THE AS CR, V.V.I.; JANSA, Petr; SIMON, Tetr; LANSDON, Eric; HU, Yunfeng, Eric; BASZCZYNSKI, Ondrejj; DEJMEK, Milan; MACKMAN, Richard, L.; (185 pag.)WO2016/105564; (2016); A1;,
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