Acidic bifunctional ionic liquid catalysis method for synthesis of benzoxanthene derivative
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A technology of benzoxanthene and ionic liquid, which is applied in the field of synthesis of benzoxanthene derivatives, can solve problems such as unreported application, and achieve the effects of less dosage, simple preparation and wide source of raw materials
Inactive Publication Date: 2015-01-28
HENAN NORMAL UNIV
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Problems solved by technology
Acidic ionic liquids with hydroxyl groups on the cation have high thermal stability, and have shown good applications in acid-catalyzed Biginilli reactions and Pechemann reactions, but their applications in the catalytic synthesis of benzoxanthene derivatives have not been reported.
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Embodiment 1
[0016] In a 10ml round bottom flask, add 1mmol benzaldehyde, 2mmol 2-naphthol, 0.1mmol acidic bifunctional ionic liquid [Choline]HSO in sequence 4 - , mixed and stirred for 1 hour at 125°C under normal pressure, the reaction process was monitored by TLC, after the reaction was completed, cooled, and 1ml of water was added, the ionic liquid was dissolved in water, and the product precipitated out, and the filtered crude product had a volume fraction of 95 % ethanol recrystallization to obtain the pure product of the target product, the productive rate is 90%.
Embodiment 2
[0018] In a 10ml round bottom flask, add 1mmol 4-nitrobenzaldehyde, 2mmol 2-naphthol, 0.1mmol acidic bifunctional ionic liquid [Choline]HSO 4 - , mixed and stirred at 125°C under normal pressure for 1 hour, the reaction process was monitored by TLC, after the reaction was completed, cooled, and 1ml of water was added, the acidic bifunctional ionic liquid was dissolved in water, and the product precipitated out, the crude product was filtered, and the crude product was passed through The pure product of the target product was obtained by recrystallization from ethanol with a volume fraction of 95%, and the yield was 99%.
Embodiment 3
[0020] In a 10ml round bottom flask, add 1mmol 3-nitrobenzaldehyde, 2mmol 2-naphthol, 0.1mmol acidic bifunctional ionic liquid [Choline]HSO 4 - , mixed and stirred at 125°C under normal pressure for 1 hour, the reaction process was monitored by TLC, after the reaction was completed, cooled, and 1ml of water was added, the acidic bifunctional ionic liquid was dissolved in water, and the product precipitated out, the crude product was filtered, and the crude product was passed through The pure product of the target product was obtained by recrystallization from ethanol with a volume fraction of 95%, and the yield was 98%.
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Abstract
The invention discloses an acidic bifunctional ionic liquid catalysis method for synthesis of benzoxanthene derivatives. The key points of the technical scheme provided by the invention are as below: the acidic bifunctional ionic liquid catalysis method for synthesis of the benzoxanthene derivative employ aromatic aldehyde and 2-naphthol as raw materials and employs the acidic bifunctional ionic liquid comprising cation containing hydrogen bond donor and Bronsted acidic anion as the catalyst, and the raw materials and the catalyst are heated to 110-125 DEG C at atmospheric pressure to synthesize the benzoxanthene derivative. The invention adopts the bifunctional acidic ionic liquid as the catalyst; the materials have wide sources and are simple for preparation and low in cost; the catalyst has low dosage, high catalytic activity, and can be recycled; and the reaction process can be performed under solvent-free conditions to avoid the use of organic solvents, so as to achieve environmental and economical double benefits. The method for the synthesis of the benzoxanthene derivatives is efficient, environmentally friendly, and conducive to large-scale industrial production.
Description
technical field [0001] The invention belongs to the technical field of synthesis of benzoxanthene derivatives, in particular to a method for catalytically synthesizing benzoxanthene derivatives with an acidic bifunctional ionic liquid. Background technique [0002] Xanthenes, especially benzoxanthene compounds, occupy a very important position in chemical organic synthesis because of their wide therapeutic range and pharmacological properties, such as antiviral drugs, antibacterial agents, anti-inflammatory drugs, antagonists etc., and it also shows good application in the field of laser technology as a photosensitive material. There have been many reports describing different methods for the synthesis of benzoxanthene derivatives, including the reaction of β-naphthol with formamide, CO, the reaction of β-naphthol with acetal, and the reaction of β-naphthol with 2-naphthalene The reaction of phenol-1-methanol, etc. It has been reported recently that benzoxanthenes are synt...
Claims
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