Some common heterocyclic compound, 437-82-1, name is 2,6-Difluoroanisole, molecular formula is C7H6F2O, 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. Recommanded Product: 437-82-1
Example 37This example illustrates the preparation of compound 101a according to the approach provided in Scheme 31. The general method is applicable to other compounds of the present invention. In this example, Rv is H and Rw is CD3. Scheme 31Preparation of (5-bromo-2-chlorophenyl)(3,5-difluoro-4-hydroxyphenyl)- methanone (96)To a solution of 5-bromo-2-chlorobenzoic acid (3.2 g, 13.5 mmol) in dichloromethane (40 mL), oxalyl dichloride (1.7 mL, 27.1 mmol) was added. Then N, N-dimethylformamide (50 muL) was added dropwise. After the vigorous evolution of gas ceased, the mixture was stirred at 250C overnight prior to removal of the volatiles under reduced pressure. The residue was dissolved in dichloromethane (20 mL) and cooled to 0 C. Aluminum trichloride (2.7 g, 20.4 mmol) was added in portions, and the mixture was stirred for 10 minutes. Then l,3-difluoro-2- methoxybenzene (2.0 g, 13.8 mmol) was added, and the mixture was stirred at 0 0C for 2 hours. Then the reaction was allowed to warm to 25 C overnight. The reaction was quenched with ice-water (30 mL) and extracted with dichloromethane (2 x 20 mL). The combined organic layers were washed with sodium hydroxide (2 M), water, hydrochloric acid (10%), and brine prior to drying over sodium sulfate. Crude product was obtained after dichloromethane was removed under reduced pressure. The sample was dissolved in tetrahydrofuran/methanol/water (30 mL, v/v/v = 2:3:1), and lithium hydroxide monohydrate (700 mg) was added. The mixture was stirred for 1 hour at 25 0C. The solvent was removed under reduced pressure. The aqueous layer was extracted with ethyl acetate (3 x 30 mL), and the extracts were washed with brine, dried over sodium sulfate, and concentrated to a crude product under reduced pressure. The residue was purified by silica column chromatography to give 1.46 g of white solid (30% yield, purity: 95%). 1H-NMR (CDCl3, 400 MHz): delta 7.59-7.62 (m, IH), 7.49-7.50 (m, IH), 7.36-7.42 (m, 3H); HPLC-MS method: Method 2, retention time 3.81 min; MS ES” (m/z): 345(M – I)”.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 437-82-1, its application will become more common.
Reference:
Patent; THERACOS, INC.; SEED, Brian; LV, Binhua; ROBERGE, Jacques, Y.; CHEN, Yuanwei; PENG, Kun; DONG, Jiajia; XU, Baihua; DU, Jiyan; ZHANG, Lili; TANG, Xinxing; XU, Ge; FENG, Yan; XU, Min; WO2010/9243; (2010); A1;,
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem