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Raaginie Tamil Segaran ; Chean Hui Ng ; Mohd Fadhlizil Fasihi Mohd Aluwi , et al. Results Chem.,2024,101627. DOI: 10.1016j.rechem.2024.101627
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Abstract: The synthesis of prenylated or geranylated acylphloroglucinol-based xanthenones with 15.1-36.9% yield was achieved via aldol condensation of 2,4,6-trihydroxy-3-prenylacetophenone (tHPA) or 2,4,6-trihydroxy-3-geranylacetophenone (tHGA) and 2-hydroxybenzaldehyde derivatives in the presence of lithium bis(trimethylsilyl)amide (LiHMDS) as deprotonating agent. This study is one of the first to report on the synthesis of xanthenones using strong non-nucleophilic base catalyst, and the described synthesis not only achieved a compound with a natural product skeleton but also formed in a simple and environmentally friendly specificity.
Keywords: Acylphloroglucinol-based xanthenone ; LiHMDS base catalyst ; Aldol condensation ; Natural product skeleton ; Eco-friendly
Purchased from AmBeed: 480-66-0 ; 18362-30-6 ; 17754-90-4
CAS No. : | 18362-30-6 | MDL No. : | MFCD01646166 |
Formula : | C7H5ClO2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | MVTWVXYIKIVAOJ-UHFFFAOYSA-N |
M.W : | 156.57 | Pubchem ID : | 528393 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P280-P305+P351+P338-P310 | 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 |
---|---|---|
62% | Potassium hydroxide (10 g) was added slowly to a stirred solution of 2-chloro-6-fluoro- benzaldehyde (14.0 g, 88.3 mmol) in dimethylsulfoxide (20 mL) at 0°C, the reaction mixture was warmed to room temperature and stirred for 18 h. The reaction mixture was diluted with water (100 mL) and acidified to pH 2 with concentrated HCl. The precipitates were filtered, washed with water (2x100 mL) and dried over anhydrous sodium sulfate, to give a residue which was used directly in the next step. Yield: 8.5 g (62percent). H NMR (400 MHz, CDCI3) delta ppm 6.85 - 7.02 (m, 2H) 7.39 - 7.47 (m, 1H) 10.41 (s, 1H) 11.95 (s, 1H). | |
61% | 2-chloro-6-hydroxybenzaldehyde To a solution of 2-chloro-6-fluorobenzaldehyde (2.44 g, 15.4 mmol) in DMSO (20 mL) at 0° C. was added potassium hydroxide (2.23 g, 33.8 mmol) slowly. The reaction mixture was allowed to stir and warm to rt overnight and then diluted with water (65 mL). The mixture was acidified to pH<1 with conc. HCl. A white solid formed and was filtered, washed with water, and dried to give 2-chloro-6-hydroxybenzaldehyde (1.48 g, 61percent). LCMS: (FA) ES-155.0. | |
With potassium hydroxide; In water; dimethyl sulfoxide; | Step D Synthesis of 6-chlorosalicylaldehyde as an intermediate A stirred solution of 40.0 grams (0.252 mole) of 2-chloro-6-fluorobenzaladehyde in 300 mL of dimethylsulfoxide was cooled to 15° C., and 36.6 grams (0.555 mole) of powdered 85percent potassium hydroxide was added portionwise at a rate to maintain the reaction mixture temperature below 25° C. Upon completion of addition, the reaction mixture was stirred at ambient temperature for 18 hours. After this time the reaction mixture was poured into 1000 mL of water and was acidified with concentrated hydrochloric acid, with stirring. The resultant solid was collected by filtration, washed with water, and dried to yield 30.1 grams of 6-chlorosalicylaldehyde; m.p. 50°-52° C. |
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