Application of 1204296-03-6, With the rapid development and complex challenges of chemical substances, the synthesis of new drugs is usually one of the most effective ways to increase yield.1204296-03-6, name is 2-Chloro-4-(difluoromethyl)pyridine, molecular formula is C6H4ClF2N, molecular weight is 163.55, as common compound, the synthetic route is as follows.
Palladium acetate (275 mg, 1.22 mmol, 0.05 eq.) and 2-dicyclohexylphosphino- 2′,4′,6′-triisopropylbiphenyl (Sigma-Aldrich, product number 638064, 1.17 g, 2.45 mmol, 0.10 eq.) are dissolved in 1,4-dioxane (10 mL) under nitrogen atmosphere, and the resulting mixture is allowed to stir at room temperature for 45 minutes. This solution is then added to a mixture of tert-butylcarbamate (Sigma, product number 167398, 4.30 g, 36.7 mmol, 1.5 eq.), CS2CO3(15.9 g, 48.8 mmol, 2.0 eq.) and 2-chloro-4-difluoromethyl-pyridine (Manchester Organics, product number U15343, 4.00 g, 24.5 mmol, 1.0 eq.) in 1,4-dioxane (80 mL) under nitrogen atmosphere. The resulting reaction mixture is then heated at 90 C for 3 hours, during which it turned brownish. After this time, the mixture is allowed to cool to room temperature. It is then diluted with ethyl acetate, washed with an aqueous saturated solution of ammonium chloride (2 x 30 mL) and deionized water. The organic layer is dried over anhydrous sodium sulfate, filtered and the solvent is evaporated under reduced pressure. The brownish residue is mixed with 4 M HC1 in dioxane (50 mL, excess) and methanol (20 mL), and then heated at 80 C for 45 minutes. Deionized water is added and the aqueous layer is washed with ethyl acetate (3 x). The aqueous layer is then basified to pH = 9, with solid sodium hydroxide. The aqueous layer is extracted with ethyl acetate (3 x). The combined organic layer is dried over anhydrous sodium sulfate, filtered and concentrated to dryness under reduced pressure. The desired product i65 is obtained as a colorless solid, which is used in the next step without further purification (98% yield). 1H NMR (400 MHz, CDC13): 5 8.16 (d,2JH,H= 5.2 Uz, 1 H), 6.74 (d, 4.8 Hz, 1 H), 6.59 (s, 1 H), 6.51 (t,2JH,F= 56 Hz, 1 H), 4.61 (br s, 2 H);19F NMR (376 MHz, CDC13): delta – 116.0 (s, 2 F).
The chemical industry reduces the impact on the environment during synthesis 1204296-03-6, I believe this compound will play a more active role in future production and life.
Reference:
Patent; PIQUR THERAPEUTICS AG; THE TRUSTEES OF THE UNIVERSITY OF PENNESYLVANIA; FABBRO, Doriano; HEBEISEN, Paul; HILLMANN-WUELLNER, Petra; STUETZ, Anton; SEYKORA, John, T.; BEAUFILS, Florent; (182 pag.)WO2017/198347; (2017); A1;,
Pyridine – Wikipedia,
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