2-amino-3,5-dichloro-1-(2-(4-bromophenyl)-2-oxoethyl)pyridinium bromide
A technology of pyridinium bromide and oxoethyl, which is applied in the field of organic synthesis, can solve the problems of difficult synthesis, high market price, and lack of literature and patent reports, and achieve the effects of simple post-processing, stable product quality, and easy control
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Embodiment 1
[0021] Dissolve 600mmol (72.0g) of acetophenone in 500mL of dichloromethane, add 2mol of liquid bromine (320g) dropwise at 0°C, and stir for 3 hours after dropping. After the reaction was completed, the solvent was distilled off under reduced pressure to obtain 2,4-dibromoacetophenone. Add 1000 mL N,N-dimethylformamide and stir to dissolve. Add 2mol 2-amino-3,5-dichloropyridine (326g), react at 50°C for 10 hours, after the reaction is completed, cool to room temperature, add 600 mL of water and 500 mL of ethyl acetate for extraction, separate the organic phase, and use Extract with ethyl acetate (3×500 mL), combine the organic phases, wash with water (2×150 mL), wash with 200 mL of saturated brine, dry over anhydrous sodium sulfate, filter, and concentrate the filtrate to obtain 2-amino-3,5 -Dichloro-1-(2-(4-bromophenyl)-2-oxoethyl)pyridinium bromide crude product, the crude product was treated with n-hexane:ethyl acetate=1:1 (volume ratio) The mixed solution was recrystalli...
Embodiment 2
[0023] 600mmol (72g) acetophenone, dissolved in 1000mL acetonitrile. 2mol liquid bromine (320g) was added dropwise at 0°C. Then react at 20° C. for 6 hours, and remove acetonitrile by rotary evaporation at the end of the reaction to obtain 2,4-dibromoacetophenone. Add 1200 mL of dichloromethane, add 4mol 2-amino-3,5-dichloropyridine (652g), react at 30°C for 15 hours, after the reaction is completed, cool to room temperature, add 600 mL of water and 800 mL of ethyl acetate for extraction, separate The organic phase was taken out, the aqueous phase was extracted with ethyl acetate (3×600 mL), the organic phases were combined, washed with water (2×250 mL), washed with 200 mL saturated brine, dried over anhydrous sodium sulfate, filtered, and the filtrate was concentrated to obtain 2-Amino-3,5-dichloro-1-(2-(4-bromophenyl)-2-oxoethyl)pyridinium bromide crude product, the crude product by n-hexane:ethyl acetate=1 : 2 (volume ratio) mixed solution recrystallization to obtain pure...
Embodiment 3
[0025] 60mmol (7.2g) of acetophenone, dissolved in 250ml of chloroform. 480 mmol (76.8 g) of liquid bromine was added dropwise at 20°C. The reaction was carried out at 20°C for 5 hours. After the reaction was completed, the solvent was removed by rotary evaporation, 120 mL of acetonitrile was added, and 300 mmol (48.9 g) of 2-amino-3,5-dichloropyridine was reacted at 10°C for 8 hours. After the reaction was completed, 60 mL of water and 60 mL of ethyl acetate were added for extraction, the organic phase was separated, and the aqueous phase was extracted with ethyl acetate (4×20 mL), the combined organic phases were washed with water (2×50 mL), and 100 mL of saturated Wash with brine, dry over anhydrous sodium sulfate, filter, and concentrate the filtrate to obtain 2-amino-3,5-dichloro-1-(2-(4-bromophenyl)-2-oxoethyl)pyridine bromide Onium crude product, the crude product was recrystallized from a mixed solution of n-hexane:ethyl acetate=1:1 (volume ratio) to obtain 24.13g of ...
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