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inquiryHello, dear friend! I'm Hansen and Allen from China. Welcome to my lookchem mall! The following is a brief introduction of our company's products and services. If you are interested in our products, please contact us by emai
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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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inquiryCangzhou Enke Pharma Tech Co.,ltd. is located in Cangzhou City, Hebei province ,where is a famous petroleum chemical industry city in China. Enke Pharma a high-tech enterprise ,and we are dedicated to developing and manufacturing new api, in
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inquiryR & D enterprises have their own stock in stockAppearance:To be subject to the object Package:Customized Application:pharmaceutical intermediates Transportation:Air Port:Shanghai;Guangzhou
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inquiryButanoic acid,3-methyl-2-oxo- cas 759-05-7Appearance:white crystalline powder Storage:Store in dry, dark and ventilated place Package:25KG drum Application:intermediate Transportation:by air, by sea, by express
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ethyl 3-methyl-2-oxobutanoate
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With water; lithium hydroxide at 0 - 25℃; for 1h; Inert atmosphere; | 95% |
With sodium hydroxide In water at 0 - 23℃; for 0.666667h; | 62% |
With potassium hydroxide |
Conditions | Yield |
---|---|
With sodium hydroxide In tetrahydrofuran for 0.5h; Ambient temperature; | 95% |
2,5-dihydro-4-(1-methylethyl)-2-(3-oxocyclohexyl)-oxazol-5-one
A
3-methyl-2-ketobutanoic acid
B
3-oxocyclohexanecarbaldehyde
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A n/a B 84% |
methyl 2,5-dihydro-4-(1-methylethyl)-γ,5-dioxo-2-oxazol-undecanoate
A
3-methyl-2-ketobutanoic acid
B
11-formyl-9-oxo-undecanoic acid methyl ester
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A n/a B 80% |
2,5-dihydro-4-(1-methylethyl)-5-oxo-2-(3-oxobutyl)-oxazol-5-one
A
4-oxopentanal
B
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A 76% B n/a |
methyl 2,5-dihydro-4-(1-methylethyl)-5-oxo-2-oxazol-propionate
A
3-methyl-2-ketobutanoic acid
B
4-oxobutanoic acid methyl ester
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A n/a B 72% |
2,5-dihydro-4-(1-methylethyl)-2-(3-oxocyclopentyl)-oxazol-5-one
A
3-methyl-2-ketobutanoic acid
B
3-formylcyclopentanone
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A n/a B 70% |
Conditions | Yield |
---|---|
With water; sodium hydroxide at 20℃; for 12h; Inert atmosphere; | 69% |
2,5-dihydro-4-(1-methylethyl)-2-(2-nitroethyl)-oxazol-5-one
A
3-methyl-2-ketobutanoic acid
B
3-nitropropanaldehyde
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A n/a B 64% |
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A n/a B 59% |
A
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A n/a B 51% |
A
L-erythro-4-deoxy-pentose
B
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A 49% B n/a |
A
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A n/a B 44% |
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A 38% B n/a |
A
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With hydrogenchloride In tetrahydrofuran Ambient temperature; | A n/a B 37% |
pyridine
tetrachloromethane
N-Bromosuccinimide
2-hydroxy-3-methylbutanenitrile
A
3-methyl-2-ketobutanoic acid
B
isobutyraldehyde
tetrachloromethane
2-bromo-3-methyl-crotonic acid
A
(E)-4-hydroxy-3-methylbut-2-enoic acid
B
3-methyl-2-ketobutanoic acid
C
2-hydroxy-3-methylbut-3-enoic acid
Conditions | Yield |
---|---|
at 100℃; |
tetrachloromethane
2-hydroxy-3-methylbut-3-enoic acid
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With potassium permanganate | |
With permanganate(VII) ion Oxydation; |
Conditions | Yield |
---|---|
With sodium hydroxide; potassium hexacyanoferrate(III) In water at 55℃; Rate constant; Kinetics; Mechanism; var. reagents conc.; | |
With potassium nitrososulfonate In various solvent(s) at 26.9℃; Thermodynamic data; Rate constant; ΔH (activ.), ΔS (activ.); | |
With kidneys-extracts |
Conditions | Yield |
---|---|
With kidneys-extracts | |
With perchloric acid; hexachloroiridate(IV) at 34.9℃; Rate constant; Kinetics; Thermodynamic data; var. temp.; ΔH(excit.), ΔG(excit.), ΔS(excit.); | |
With pyridine-4-carbaldehyde; hydrogenchloride; 1,8-diazabicyclo[5.4.0]undec-7-ene 1.) DMF, r.t., 5 h; Yield given. Multistep reaction; | |
Multi-step reaction with 2 steps 1: (heating) 2: aq. NaOH View Scheme | |
With ω-transaminase |
2-hydroxy-3-methylbutanoic acid
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With Fructose 1,6-bisphosphate; Bacillus stearothermophilus; triethanolamine hydrochloride; NADH at 25℃; Rate constant; Equilibrium constant; also in presence of Gln102 or Asn enzyme; | |
With potassium hydroxide; potassium permanganate at 20℃; |
isobutyryl cyanide
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With hydrogenchloride |
2,5-Dimethyl-4-hexen-3-ol
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With potassium permanganate |
α-chloro β-dimethyl acrylic acid
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With sodium hydroxide |
Conditions | Yield |
---|---|
With sodium hydroxide |
2-isopropyl-5-methyl-hex-2-enal
A
3-methylbutyric acid
B
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With potassium permanganate |
Conditions | Yield |
---|---|
With water; copper(II) ion Decarboxylation.pH 2-7; | |
With aluminium(III) ion; water Decarboxylation.pH 2-7; | |
With water; nickel(II) Decarboxylation.pH 2-7; | |
With water; manganese(II) Decarboxylation.pH 2-7; | |
at 25℃; Kinetics; Wss. Loesungen vom pH 0 bis pH 9, auch in Gegenwart verschiedener Metall-Ionen..Decarboxylation; |
Conditions | Yield |
---|---|
With sulfuric acid | |
With hydrogenchloride | |
With hydrogen bromide; acetic acid |
Conditions | Yield |
---|---|
With ammonium salts; Aspergillus niger; sulfite(2-) |
3-methyl-2-ketobutanoic acid
Acetanilid
N-(2-iso-butyrylphenyl)acetamide
Conditions | Yield |
---|---|
With ammonium peroxydisulfate; palladium(II) trifluoroacetate In diethylene glycol dimethyl ether at 20℃; | 93% |
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With 1-hydroxybenzotriazol-hydrate; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; triethylamine | 89% |
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
Stage #1: 3-methyl-2-ketobutanoic acid With pyrographite; potassium hydroxide In water pH=7; Reflux; Large scale; Stage #2: With calcium chloride In water at 0.2℃; for 3h; Solvent; Reagent/catalyst; Reflux; Large scale; | 87.5% |
3-methyl-2-ketobutanoic acid
(S)-2-Hydroxy-3-methylbutanoic acid
Conditions | Yield |
---|---|
With NAD; hydrogen In hydrogenchloride for 42h; Ambient temperature; | 86% |
diazomethane
3-methyl-2-ketobutanoic acid
methyl 3-methyl-2-ketobutanoate
Conditions | Yield |
---|---|
In diethyl ether at 0℃; | 84% |
3-methyl-2-ketobutanoic acid
4-methoxybenzoic acid hydrazide
2-(4-Methoxybenzoylhydrazono)-3-methylbuttersaeure
Conditions | Yield |
---|---|
With hydrogenchloride In ethanol; water at 60℃; for 2h; | 84% |
Conditions | Yield |
---|---|
With dipotassium peroxodisulfate; palladium diacetate In water; dimethyl sulfoxide at 20℃; for 3h; | 83% |
3-methyl-2-ketobutanoic acid
(S)-tert-butyl 2-(hydroxyamino)-3-methylbutanoate
Conditions | Yield |
---|---|
Stage #1: 3-methyl-2-ketobutanoic acid With oxalyl dichloride; N,N-dimethyl-formamide In dichloromethane at 20℃; for 15h; Inert atmosphere; Stage #2: (S)-tert-butyl 2-(hydroxyamino)-3-methylbutanoate With sodium carbonate In dichloromethane; water at 20℃; for 30h; Inert atmosphere; | 82% |
Conditions | Yield |
---|---|
With dmap; dicyclohexyl-carbodiimide In dichloromethane | 80% |
3-methyl-2-ketobutanoic acid
2-(aminocarbonyl)-1-pyrrolidinecarboxylic acid, phenylmethyl ester
Z-Pro-Δ Val
Conditions | Yield |
---|---|
toluene-4-sulfonic acid In benzene for 10h; Heating; | 75% |
3-methyl-2-ketobutanoic acid
(S)-2-amino-3-phenylpropionamide hydrochloride
Conditions | Yield |
---|---|
Stage #1: (S)-2-amino-3-phenylpropionamide hydrochloride With triethylamine In dichloromethane at 4℃; Stage #2: 3-methyl-2-ketobutanoic acid With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride In dichloromethane at 4 - 20℃; for 2.5h; | 74% |
Conditions | Yield |
---|---|
With N,N,N,N,N,N-hexamethylphosphoric triamide; N,N-dimethyl-formamide In tetrahydrofuran at 20℃; for 15h; Addition; | 73% |
3-methyl-2-ketobutanoic acid
benzoic acid hydrazide
2-Benzoylhydrazono-3-methylbuttersaeure
Conditions | Yield |
---|---|
In water at 65℃; for 2h; | 70% |
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With dmap; dicyclohexyl-carbodiimide In diethyl ether at 0 - 23℃; for 18h; | 70% |
C6H4NCH2CHCCH2
3-methyl-2-ketobutanoic acid
2-isopropyl-4-methylquinoline
Conditions | Yield |
---|---|
With (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile; tetraethylammonium hexafluorophosphate; trifluoroacetic acid In acetonitrile at 50℃; Schlenk technique; Electrochemical reaction; Irradiation; Inert atmosphere; | 68% |
3-methyl-2-ketobutanoic acid
O-benzyl carbamate
2-(((benzyloxy)carbonyl)amino)-3-methylbut-2-enoic acid
Conditions | Yield |
---|---|
With toluene-4-sulfonic acid In benzene at 99.85℃; for 8h; | 67% |
With toluene-4-sulfonic acid In benzene at 100℃; for 8h; | 67% |
With toluene-4-sulfonic acid In benzene at 100℃; for 8h; | 67% |
Conditions | Yield |
---|---|
With oxygen; silver(I) acetate; lithium carbonate In 1,2-dichloro-ethane at 100℃; under 760.051 Torr; for 16h; Schlenk technique; Green chemistry; | 67% |
1,4-pyrazine
3-methyl-2-ketobutanoic acid
2-methyl-1-(pyrazin-2-yl)propan-1-one
Conditions | Yield |
---|---|
With ferrous(II) sulfate heptahydrate; ammonium peroxydisulfate; formic acid; dimethyl sulfoxide In dichloromethane; water at 40℃; Minisci Aromatic Substitution; | 65% |
3-methyl-2-ketobutanoic acid
2-Hydrazino-2-thiazolin-hydrobromid
2,3-Dihydro-6-isopropyl-5H-thiazolo<2,3-c><1,2,4>-triazin-5-on
Conditions | Yield |
---|---|
With sodium ethanolate In ethanol for 18h; Heating; | 64% |
Conditions | Yield |
---|---|
With tetrakis(acetonitrile)copper(I)tetrafluoroborate In toluene at 130℃; for 20h; Inert atmosphere; Sealed tube; diastereoselective reaction; | 64% |
3-methyl-2-ketobutanoic acid
Conditions | Yield |
---|---|
With dmap; dicyclohexyl-carbodiimide In diethyl ether at 0 - 23℃; for 18h; | 62% |
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