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CAS No. : | 73721-78-5 | MDL No. : | MFCD08276267 |
Formula : | C9H8N2O5 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | HHNTZMHFBQIQAK-UHFFFAOYSA-N |
M.W : | 224.17 | Pubchem ID : | 153453 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
35% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine; In water; N,N-dimethyl-formamide; at 20.0℃; for 24.0h;Inert atmosphere; | Step 3. Synthesis of rac-2-Acetamido-N-(2,6-dioxopiperidin-3-yi)-6-nitrobenzamide [00302] The starting acid (3.10 g, 13.8 mmol) was mixed with hydroxybenzotriazole (HOBt, 2.12 g of the hydrate, 13.8 mmol) and l-ethyl-3-(3-dimethylaminopropyl)- carbodiimide hydrochloride (EDC, 2.54 g, 13.3 mmol), under a nitrogen atmosphere. N,N- dimethylformamide (DMF, 21.4 mL) was added and the mixture was stirred for 30 minutes at room temperature. rac-3-Aminopiperidine-2,6-dione hydrochloride (5.01 g, 30.4 mmol) was added, followed by Nu,Nu-diisopropylethylamine (DIEA, 9.63 mL, 55.3 mmol). The reaction mixture was stirred at 20C, while monitoring by HPLC. After 24 hours, the reaction mixture showed approximately 40% conversion to the desired product containing some remaining starting acid, but no amine. Then, the reaction mixture was slowly poured into 200 mL water with vigorous stirring. After 20 minutes, a white precipitate began to form. The mixture was placed in the refrigerator for 18 hours. Then, the precipitate was isolated by filtration. The filter cake was washed with 50 mL ether, and air dried to provide the title compound (1.60 g, 4.79 mmol, 35%) as a white powder. XH NMR (300 MHz, DMSO-d6) delta 1 1.16 (s, 1H), 9.40 (s, 1H), 9.34 (d, J = 8.0 Hz, 1H), 8.53 (d, J = 7.5 Hz, 1H), 7.89 (dd, J = 8.2, 0.98 Hz, 1H), 7.66 (t, J = 8.3 Hz, 1H), 4.79 (m, 1H), 2.85(m, 1H), 2.59 (m, 1H), 2.21 (m, 1H), 2.20 (s, 3H), 2.03 (m, 1H). MS (ESI-) calc. for [Ci4H14N406-H]" 333.3, found 333.2. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Alkaline conditions; | Reaction of compound 1 with acetyl chloride andbase, such as Et3N, Hunig?s Base, or imidazole in eitheracetonitrile or tetrahydrofuran at either room temperature orC. provided compound la. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
for 2191.5h; | Acetic anhydride was selected as an acylation and dehydration reagent. Initially, compound 1 was refluxed in neat acetic anhydride (4.8 equivalents), followed by cooling and filtration to provide compound 2, which contained 5 wt % of acetic acid and was converted to an acetylated compound 1 ,2-acetamido-6-nitrobenzoic acid 1 a, over a three month period under ambient storage in a glass bottle. In order to improve the stability of compound 2, the amount of acetic anhydride was reduced to 2.2 equivalents and isopropyl acetate was used as an alternative solvent. |