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CAS No. : | 196799-45-8 | MDL No. : | MFCD06200853 |
Formula : | C9H8O2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | CLXXUGOCVBQNAI-UHFFFAOYSA-N |
M.W : | 148.16 | Pubchem ID : | 2795018 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H332-H335 | Packing Group: | N/A |
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 |
---|---|---|
With hydrogenchloride; dmap; N-ethyl-N,N-diisopropylamine; In tetrahydrofuran; | EXAMPLE 206 STR276 2,3-Dihydrobenzofuran-7-carboxaldehyde A solution of 2,3-dihydrobenzofuran-7-carboxylic acid (1.0 g, 6.09 mmol, 1.0 equiv.), dimethylmethoxyamine hydrochloride (654 mg, 6.7 mmol, 1.1 equiv.), diisopropylethylamine (DIEA) (2.35 ml, 13.4 mmol, 2.2 equiv.), benzotriazole-1-yl-oxy-tris-pyrrolidino-phosphonium hexafluorophosphate (PyBOP) (3.48 g, 6.7 mmol, 1.1 equiv.) and 4-dimethylaminopyridine (DMAP) (74 mg, 0.67 mmol, 0.1 equiv.) in anhydrous THF (20 ml) was stirred for 18 hr under argon. The reaction mixture was then diluted with EtOAc (100 ml) and washed with aqueous sat. NaHCO3 (2*150 ml) and aqueous 1N HCl (2*150 ml), the oragnic layer was dried over MgSO4, filtered and solvent removed. yield: 1.06 mg, 84%. LS-MS calcd 207, found 208. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium tetrahydroborate; triethanolamine; 4,5-dichloro-1-phenylpyridazin-6-one; In tetrahydrofuran; water; ethyl acetate; | Preparation of 2,3-dihydrobenzofuran-7-carbaldehyde 2,3-Dihydrobenzofuran-7-carboxylic acid (820 mg, 5 mmol) was dissolved in THF (10 mL). To the solution was added TEA (0.7 mL, 5 mmol) and methylchloroformate (0.43 mL, 5 mmol). The solution was stirred for 0.5 hr. The white precipitates were removed by filtration, the filtrate was added to a solution of NaBH4 (437 mg, 12.5 mmol) in H2O (5 mL). The resulting solution was stirred overnight. The reaction mixture was neutralized with 2 M aqueous HCl solution and then extracted with EtOAc. The organic layer was washed with brine, dried over anhydrous Na2SO4 and concentrated in vacuo. The crude alcohol was dissolved in DGM. To the solution was added PCC (1.83 g, 7.5 mmol). The mixture was stirred for 2 hrs at room temperature and diluted with diethyl ether, then ether layers were decanted. Combined organic layer was filtered though a layer of Celite. The filtrate was concentrated to give crude product. The crude was purified from column with 10% EtOAc/hexane to afford 450 mg of 2,3-dihydrobenzofuran-7-carbaldehyde as a slightly yellow solid. HPLC 4.3 min. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
94% | 7-Bromo-2,3-dihydrobenzofuran (74A) under nitrogen protection(2.0g, 10.05mmol) dissolved in tetrahydrofuran(20 mL), cooled to -78 C, n-butyl lithium (4.5 mL, 11.05 mmol)Add dropwise to the reaction, and add the stirring reaction for 0.5 hours.Further, N,N-dimethylformamide (1.1 g, 15.07 mmol) was added dropwise to the reaction.Continue to react for 1 hour. The reaction solution was quenched with saturated aqueous ammonium chloride (50 mL).The aqueous phase was extracted with ethyl acetate (30 mL×3).Wash with saturated sodium chloride solution (50 mL), dry over anhydrous sodiumAfter the filtrate is concentrated, the crude product is subjected to column chromatography.(Petroleum ether/ethyl acetate (v/v) = 10:1 to 4:1) to give an oily liquid 2,3-dihydrobenzofuran-7-carbaldehyde (74B)(1.4 g, yield: 94%). |
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