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CAS No. : | 1076-38-6 | MDL No. : | MFCD00006856 |
Formula : | C9H6O3 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | VXIXUWQIVKSKSA-UHFFFAOYSA-N |
M.W : | 162.14 | Pubchem ID : | 54682930 |
Synonyms : |
Benzotetronic Acid;NSC 11889;4-Coumarinol
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-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 piperidine; In ethanol; at 20℃; for 4h; | General procedure: DBH was synthesized according to a previous report [14]. Amixture of 4-(di-p-tolyl-amino)-benzaldehyde (10 mmol) and 4-hydroxycoumarin (20 mmol) was dissolved in 100 mL of EtOH. Afew drops of piperidine were added, and the mixture was stirredfor 4 h at room temperature. After reaction completion as determinedby TLC, water was added until precipitation occurred. Afterfiltering the precipitates, they were sequentially washed with icecooledwater and ethanol and then dried under a vacuum. 3,3'-(4-Di-p-tolyl-amino-benzylidene)-bis-(4-hydroxycoumarin) (DBH): m.p. 213-214 °C. IR(KBr pellet cm-1): 3440, 2350, 1653, 1604, 1560, 1344, 1095, 761 cm-1. 1H NMR (CDCl3, delta, ppm): 11.584(s, 1H), 11.301(s, 1H), 8.014-8.085(m, 2H), 7.616-7.658(m, 2H), 7.411-7.431(d, 4H), 6.992-7.076(m, 12H), 6.067(s, 1H), 2.315(s, 6H). HRMS (ESI+): m/z: calcd for C39H29NO6: 630.1887 [M + Na+]; found: 630.1879. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
84% | With potassium 2-oxoimidazolidine-1,3-diide; In water; at 20℃; for 2h;Green chemistry; | General procedure: A mixture containing aldehyde (1 mmol), beta-naphthol (1 mmol; 1.44 g), 4-hydroxycoumarin (1 mmol; 1.62 g), 1mmol% of POImD and 10mL H2O were stirred at room temperature for the required reaction times. The progress of the reaction was monitored by TLC (EtOAc: petroleum ether 1:4). Having completed the reaction, we extracted the product with CHCl3/H2O. After separation of phases and evaporation of the organic phase and recrystallizationof the residue, the pure product was obtained. The aqueous phase was concentrated under reduced pressure to recover the catalyst for subsequent use. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With dmap; In ethanol; for 5h;Reflux; | General procedure: Compounds 1?3 were synthesized according to a reported procedure [11]. A mixture of 1,1-dimethyl-3,5-cyclohexanedione (3,5-cyclohexanedione, 4-hydroxycoumarin) (10 mmol), 4-(di-p-tolyl-amino)-benzaldehyde (10 mmol), malononitrile (10 mmol) and 4-(dimethylamino)pyridine (DMAP) (1 mmol) in ethanol (100 mL) was refluxed for 5 h and then cooled to room temperature. The precipitates were filtered and sequentially washed with ice-cooled water and ethanol and then dried under a vacuum. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
72% | With laccase; In aq. phosphate buffer; at 20℃; for 24h;pH 7.15;Enzymatic reaction; | General procedure: The laccase (Suberase®, 2.0mL) was added to a mixture of the catechol (2.0mmol), coumarin (2.0mmol) and phosphate buffer (20.0mL, 0.10M, pH 7.15) in a 250mL round bottom flask stirred under air at rt. More laccase (2.0mL) was added after 2, 18 and 20h. The mixture was vigorously stirred under air until the substrates were consumed as judged by TLC. The mixture was extracted with EtOAc and washed two times with water (20.0mL). The organic phases were then combined and the solvent evaporated. The residue, a powder, was purified by washing with EtOAc or by flash chromatography or recrystallization. The recrystallization was accomplished from a combination of MeOH and EtOAc. Products were characterized by 1H NMR, 13C NMR, and MS. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
73% | With tetraethylammonium bromide; In water; for 2h;Reflux; | General procedure: 6-Fluoro-4-hydroxy /6-chloro-4-hydroxy /4-hydroxy coumarin(1 mmol), and a variety of aromatic aldehydes (0.5 mmol), as well as 10 mol% of tetraethylammonium bromide (TEAB) were dissolved indistilled water (15 mL) in a 100 mL round-bottommed flask. The reactionmixture was refluxed for 2 h. Periodic TLC was taken to check theprogress of reaction. Resulting precipitates were filtered, and washedwith distilled water. This afforded products 1-44 in high yields. |
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