4858-85-9, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 4858-85-9 name is 2,3-Dichloropyrazine, This compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.
Reference Production Example 19 A mixture of 3.73 g of 2,3-dichloropyrazine, 8.80 g of diethyl malonate, 30 ml of dimethyl sulfoxide and 17.9 g of cesium carbonate was stirred for 8 hours at 110C under a nitrogen atmosphere. The reaction mixture was allowed to cool to room temperature, then, to this was added ice water and extracted with ethyl acetate. The organic layer was washed with saturated brine twice, and dried over anhydrous magnesium sulfate, then, concentrated under reduced pressure. 3.67 g of the resultant residue was subjected to silica gel column chromatography, to obtain 2.69 g of diethyl (3-chloro-2-pyrazinyl) malonate. 1H-NMR (CDCl3, TMS) delta (ppm): 1.27 (6 H, t, J=7.2 Hz), 4.30 (4 H, q, J=7.2 Hz), 5.20 (1 H, s), 8.36 (1 H, d, J=2.6 Hz), 8.50 (1 H, d, J=2.6 Hz)
At the same time, in my other blogs, there are other synthetic methods of this type of compound, 2,3-Dichloropyrazine, and friends who are interested can also refer to it.
Reference:
Patent; Sumitomo Chemical Company, Limited; EP1958946; (2008); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem