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inquiryHenan Wentao Chemical Product Co.,Ltd is Located in Zhengzhou High-tech Development Zone with import and export license, We passed ISO 9001:2008 as well, Henan Wentao has developed more than 1000 compounds, which are widely used in the fields of prod
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inquirySuperiority We can customize and synthesize products that other suppliers may not be able to provide. Advantage cof, mof ligand manufacturer best service, company and transport
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inquiryJ&H CHEM R&D center can offer custom synthesis according to the contract research and development services for the fine chemicals, pharmaceutical, biotechnique and some of the other chemicals. J&H CHEM has some Manufacturing base in Jia
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inquiryHunan chemfish Pharmaceutical co.,Ltd.located in Lugu High-tech industral park ,Hunan province . with its own R&D center and more than 10000㎡manufacture plant . Chemfish owns 40 reactors from 1000L to 8000L. With complete auxiliary equipment as
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Shandong Mopai Biotechnology Co., LTD is a leading manufacturer and supplier of chemicals in China. We develop produce and distribute high quality pharmaceuticals, intermediates, special chemicals and OLED intermediates and other fine chemicals. W
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inquiry1.Applied in food field.it can improve the immune system and prolong life. 2.Appliedin cosmetic field.it can improve the skin care. 3.Applied in pharmaceutical field.it can treat various dieases. 4.Our product quality assurance will make our customer
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inquiryLocated in Hangzhou National Hi-Tech Industrial Development Zone, zhongqichem is a technical company mainly focus on the Custom synthesis, manufacturing, sales of chemicals to various industries. Benefiting from the outstanding customer service and h
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inquiryhigh purity lowest priceAppearance:solid or liquid Storage:in sealed air resistant place Package:drum and bag Application:for pharma use Transportation:by sea or air Port:Beijing or Guangzhou
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inquirydiazomethane
2-pyrazylcarboxylic acid
methyl pyrazine-2-carboxylate
Conditions | Yield |
---|---|
In diethyl ether; dichloromethane at 20℃; for 0.25h; | 100% |
2-chloropyrazin
methanol
carbon monoxide
methyl pyrazine-2-carboxylate
Conditions | Yield |
---|---|
With dichloro[2,2'-bis(diphenylphosphino)-1,1'-binaphthyl]palladium(II); triethylamine at 100℃; under 2585.74 Torr; for 4h; | 99% |
With 1,3-bis-(diphenylphosphino)propane; palladium diacetate; triethylamine In acetonitrile at 180℃; under 25502.6 Torr; Flow reactor; | 61% |
With triethylamine; palladium bis(dibenzylideneacetone)palladium(0); triphenylphosphine at 120℃; under 29420.3 Torr; for 16h; other chloropyrazines; | 93 % Chromat. |
With ethyl azide; triphenylphosphine; bis(dibenzylideneacetone)-palladium(0) at 120℃; under 29420.3 Torr; for 16h; | 93 % Chromat. |
Conditions | Yield |
---|---|
With sulfuric acid for 2h; Reflux; | 98% |
With sulfuric acid for 48h; Heating; | 95% |
With sulfuric acid at 80 - 85℃; for 5h; | 94.8% |
Conditions | Yield |
---|---|
With sodium persulfate; sulfuric acid; silver nitrate In dichloromethane; water for 1.5h; Heating; | 93% |
Conditions | Yield |
---|---|
With Eosin Y; di-tert-butyl 1,4-dihydro-2,6-dimethyl-3,5-pyridine-dicarboxylate In acetonitrile at 20℃; for 5h; Inert atmosphere; Irradiation; chemoselective reaction; | 88% |
Conditions | Yield |
---|---|
Stage #1: 2-pyrazylcarboxylic acid With sulfuric acid In methanol at 20℃; for 5h; Reflux; Stage #2: With sodium hydrogencarbonate In methanol pH=8.5; | 63.63% |
Multi-step reaction with 2 steps 1: 74 percent / SOCl2 / benzene / 2 h / Heating 2: pyridine / CH2Cl2 / a) 0 deg C, 1 h, b) RT, overnight View Scheme | |
With thionyl chloride; sodium bicarbonate In methanol; di-isopropyl ether; water | |
With sulfuric acid; sodium hydrogencarbonate In methanol; toluene |
Conditions | Yield |
---|---|
With potassium carbonate In N,N-dimethyl-formamide for 72h; | 8% |
3-[(methyloxy)carbonyl]-2-pyrazinecarboxylic acid
methyl pyrazine-2-carboxylate
Conditions | Yield |
---|---|
With pyridine In dichloromethane a) 0 deg C, 1 h, b) RT, overnight; |
2-ethylpyrazine
methyl pyrazine-2-carboxylate
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: potassium permanganate / H2O / 20 °C 2: HCl View Scheme |
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: 210 °C / 3 - 4 Torr 2: HCl View Scheme |
Conditions | Yield |
---|---|
In methanol |
methanol
4-[(3-chloro-2-methylphenyl)carbonyl]-2-piperazinone
methyl pyrazine-2-carboxylate
Conditions | Yield |
---|---|
With thionyl chloride at 20℃; Reflux; |
methyl pyrazine-2-carboxylate
Conditions | Yield |
---|---|
With potassium carbonate In dichloromethane for 5h; | 37 g |
Conditions | Yield |
---|---|
With hydrazine In ethanol for 2h; Heating / reflux; | 100% |
With hydrazine In ethanol for 2h; Heating / reflux; | 100% |
With hydrazine In ethanol for 2h; Reflux; | 99% |
Conditions | Yield |
---|---|
Stage #1: methyl pyrazine-2-carboxylate With lithium aluminium tetrahydride In tetrahydrofuran at -78 - 72℃; for 0.333333h; Stage #2: With hydrogenchloride; water | 100% |
With lithium aluminium tetrahydride In tetrahydrofuran at -83℃; for 2h; | 68% |
With lithium aluminium tetrahydride In tetrahydrofuran at -78℃; for 1.83333h; Inert atmosphere; Schlenk technique; | 53.4% |
methyl pyrazine-2-carboxylate
propanoic acid methyl ester
methyl 2-methyl-3-(pyrazin-2-yl)-3-oxopropionate
Conditions | Yield |
---|---|
Stage #1: methyl pyrazine-2-carboxylate With sodium hydride In toluene at 15 - 25℃; for 0.5h; Industrial scale; Stage #2: propanoic acid methyl ester In methanol; toluene at 15 - 40℃; Temperature; Solvent; Reagent/catalyst; Industrial scale; | 100% |
Stage #1: propanoic acid methyl ester With potassium tert-butylate In tetrahydrofuran at 0℃; for 0.5h; Stage #2: methyl pyrazine-2-carboxylate In tetrahydrofuran at 0 - 25℃; for 3.5h; Stage #3: With ammonium chloride In tetrahydrofuran for 0.5h; | 89% |
With sodium hydride In N,N-dimethyl-formamide; mineral oil at 20℃; for 5h; Inert atmosphere; | 79% |
With NaH; ammonium chloride In toluene |
Conditions | Yield |
---|---|
With sodium hydride In tetrahydrofuran; mineral oil for 20h; Reflux; | 96% |
Conditions | Yield |
---|---|
With sodium tetrahydroborate; sodium methylate In methanol at 25℃; for 3h; Inert atmosphere; | 95% |
Stage #1: methyl pyrazine-2-carboxylate With sodium tetrahydroborate In water for 0.5h; Stage #2: With water; potassium carbonate In ethanol for 0.5h; | 80% |
With sodium tetrahydroborate; calcium chloride In ethanol at 25℃; for 5h; | 75% |
Conditions | Yield |
---|---|
In dimethyl sulfoxide at 20℃; for 12h; | 94% |
methyl pyrazine-2-carboxylate
bis(pinacol)diborane
methyl 1,4-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,4-dihydropyrazine-2-carboxylate
Conditions | Yield |
---|---|
In pentane N2; ligand and B compd. (1.1:1 molar ratio) stirred at room temp. for 2 h; | 93% |
In pentane at 20℃; for 2h; Inert atmosphere; | 93% |
methyl pyrazine-2-carboxylate
methylhydrazine
pyrazine-2-carboxylic acid N'-methylhydrazide
Conditions | Yield |
---|---|
In ethanol Heating; | 90% |
In ethanol Heating; | 81.1% |
In ethanol for 1.5h; Heating; | 68% |
methyl pyrazine-2-carboxylate
benzylamine
pyrazine-2-carboxylic acid benzylamide
Conditions | Yield |
---|---|
With niobium(V) oxide In neat (no solvent) at 140℃; for 30h; Molecular sieve; Inert atmosphere; | 90% |
for 2h; Heating; | 70% |
With potassium phosphate; 2,2,2-trifluoroethanol In tetrahydrofuran at 90℃; for 22h; Sealed tube; | 64% |
Conditions | Yield |
---|---|
With sodium t-butanolate In neat (no solvent) at 20℃; for 1h; Inert atmosphere; Schlenk technique; Green chemistry; | 90% |
methyl pyrazine-2-carboxylate
trifluoromethylsulfonic anhydride
1,1-bis(trimethylsiloxy)-2-methylprop-1-ene
Conditions | Yield |
---|---|
Stage #1: methyl pyrazine-2-carboxylate; trifluoromethylsulfonic anhydride In dichloromethane at -30℃; Inert atmosphere; Stage #2: 1,1-bis(trimethylsiloxy)-2-methylprop-1-ene In dichloromethane at -30 - 20℃; for 12h; Inert atmosphere; | 89% |
methyl pyrazine-2-carboxylate
Conditions | Yield |
---|---|
With hydroxylamine hydrochloride; sodium hydroxide In methanol for 24h; Inert atmosphere; Schlenk technique; Cooling with ice; | 89% |
methyl pyrazine-2-carboxylate
methyl 1,4,5,6-tetrahydropyrazine-2-carboxylate
Conditions | Yield |
---|---|
palladium-carbon In methanol | 86% |
With hydrogen; palladium on activated charcoal |
Conditions | Yield |
---|---|
With hydroxylamine In methanol at 20℃; for 72h; | 85% |
With hydroxylamine |
methyl pyrazine-2-carboxylate
trifluoromethylsulfonic anhydride
(Bis-trimethylsilanyloxy-methylene)-cyclohexane
Conditions | Yield |
---|---|
Stage #1: methyl pyrazine-2-carboxylate; trifluoromethylsulfonic anhydride In dichloromethane at -30℃; Inert atmosphere; Stage #2: (Bis-trimethylsilanyloxy-methylene)-cyclohexane In dichloromethane at -30 - 20℃; for 12h; Inert atmosphere; | 84% |
methyl pyrazine-2-carboxylate
2-aminomethylpyrazine
Conditions | Yield |
---|---|
In methanol for 168h; Reflux; | 83% |
Conditions | Yield |
---|---|
With n-butyllithium In tetrahydrofuran; diethyl ether; hexane -80 deg C to rt; | 80% |
Conditions | Yield |
---|---|
In chloroform at 5℃; for 24h; Inert atmosphere; | 78% |
methyl pyrazine-2-carboxylate
5-amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)pyrazole
N-[3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)pyrazole-5-yl]pyrazine-2-carboxamide
Conditions | Yield |
---|---|
With hydrogenchloride; CH3ONa In methanol; water; ethyl acetate; acetonitrile | 77% |
Conditions | Yield |
---|---|
With sodium methylate In N,N-dimethyl-formamide for 2.5h; Heating; | 76% |
Conditions | Yield |
---|---|
With sodium hydride In N,N-dimethyl-formamide; mineral oil at 20℃; for 5h; Inert atmosphere; | 75% |
(2-aminomethylpyridine)
methyl pyrazine-2-carboxylate
pyrazine-2-carboxylic acid (pyridine-2-ylmethyl)-amide
Conditions | Yield |
---|---|
In methanol for 120h; Reflux; | 73% |
methyl pyrazine-2-carboxylate
6-chloro-pyrazine-2-carboxylic acid methyl ester
Conditions | Yield |
---|---|
With N-chloro-succinimide In N,N-dimethyl-formamide at 80℃; | 72% |
Multi-step reaction with 2 steps 1: 3-chloro-benzenecarboperoxoic acid / 1,2-dichloro-ethane / 16 h / 60 °C 2: thionyl chloride / 8 h / Reflux View Scheme | |
Multi-step reaction with 2 steps 1: 3-chloro-benzenecarboperoxoic acid / 1,2-dichloro-ethane / 60 °C 2: thionyl chloride / 85 °C View Scheme | |
Multi-step reaction with 2 steps 1: 3-chloro-benzenecarboperoxoic acid / 1,2-dichloro-ethane / 60 °C 2: thionyl chloride / 85 °C View Scheme | |
Stage #1: methyl pyrazine-2-carboxylate With 3-chloro-benzenecarboperoxoic acid In 1,2-dichloro-ethane at 60℃; for 16h; Stage #2: With thionyl chloride at 75℃; for 8h; |
Conditions | Yield |
---|---|
With 3-chloro-benzenecarboperoxoic acid In 1,2-dichloro-ethane at 60℃; for 16h; | 64% |
With 3-chloro-benzenecarboperoxoic acid In 1,2-dichloro-ethane at 60℃; for 16h; | 64% |
With 3-chloro-benzenecarboperoxoic acid In 1,2-dichloro-ethane at 60℃; for 16h; | 64% |
With 3-chloro-benzenecarboperoxoic acid In dichloromethane at 20℃; for 48h; | 22% |
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