Synthesis method of 6-bromoimidazo[1,2-alpha]pyridyl-3-formic acid
A synthetic method, 2-a technology, applied in the direction of organic chemistry, etc., can solve the problems of many by-products, expensive, cumbersome operation, etc., and achieve the effects of mild reaction conditions, stable product quality, and simple post-treatment
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Embodiment 1
[0027] 80mL (71.7g) of N,N-dimethylformamide dimethyl acetal is both solvent and reaction raw material, react with 2-amino-5-bromopyridine (34.6g, 200mmol) at 70°C for 5 hours, and the reaction ends Prepare N,N-dimethyl-N'-2-(5-bromo-pyridinyl)-formamidine intermediate, remove excess N,N-dimethylformamide dimethyl acetal by rotary evaporation, add 120 mL (125 g) dioxane, NaHCO 3 (25.2g, 300mmol) and ethyl bromoacetate (50.1g, 300mmol), react at 80°C for 10 hours, after the reaction is completed, cool to room temperature, add 600 mL of water and 200 mL of ethyl acetate for extraction, separate the organic phase and the aqueous phase Extract with ethyl acetate (3×200 mL), combine the organic phases, wash with water (2×150 mL), wash with 200 mL saturated brine, anhydrous Na 2 SO 4 Dry, filter, and concentrate the filtrate to obtain the crude product of ethyl 6-bromoimidazo[1,2-a]pyridine-3-carboxylate, which is mixed with n-hexane:ethyl acetate=3:1 (volume ratio) The solution ...
Embodiment 2
[0030] 80mL (71.7g) of N,N-dimethylformamide dimethyl acetal is both a solvent and a reaction raw material, react with 2-amino-5-bromopyridine (34.6g, 200mmol) at 70°C for 5 hours, and the reaction ends Prepare N,N-dimethyl-N'-2-(5-bromo-pyridinyl)-formamidine intermediate, remove excess N,N-dimethylformamide dimethyl acetal by rotary evaporation, add 120 mL (103 g) toluene, K 2 CO 3 (20.8g, 150mmol) and ethyl bromoacetate (50.1g, 300mmol), react at 80°C for 10 hours, after the reaction is completed, cool to room temperature, add 600 mL of water and 200 mL of ethyl acetate for extraction, separate the organic phase and the aqueous phase Extract with ethyl acetate (3×200 mL), combine the organic phases, wash with water (2×150 mL), wash with 200 mL saturated brine, anhydrous Na 2 SO 4 Dry, filter, and concentrate the filtrate to obtain the crude product of ethyl 6-bromoimidazo[1,2-a]pyridine-3-carboxylate, which is mixed with n-hexane:ethyl acetate=3:1 (volume ratio) The sol...
Embodiment 3
[0033] N,N-Dimethylformamide dimethyl acetal (80mL) is both a solvent and a reaction raw material, reacted with 2-amino-5-bromopyridine (34.6g, 200mmol) at 60°C for 8 hours, and the reaction was completed N,N-Dimethyl-N'-2-(5-bromo-pyridinyl)-formamidine intermediate, rotary evaporation to remove excess N,N-dimethylformamide dimethyl acetal, add 120 mL (114g) N,N-dimethylformamide (DMF), triethylamine (30.3g, 300mmol) and ethyl bromoacetate (50.1g, 300mmol), react at 100°C for 8 hours, after the reaction is complete, cool to room temperature , add 600 mL of water and 200 mL of ethyl acetate for extraction, separate the organic phase, extract the water phase with ethyl acetate (3×200 mL), combine the organic phases, wash with water (2×150 mL), and 200 mL of saturated saline Wash, anhydrous Na 2 SO 4 Dry, filter, and concentrate the filtrate to obtain the crude product of ethyl 6-bromoimidazo[1,2-a]pyridine-3-carboxylate, which is mixed with n-hexane:ethyl acetate=3:1 (volume ...
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