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Canale, Vittorio ; Czekajewska, Joanna ; Klesiewicz, Karolina , et al. Eur. J. Med. Chem.,2023,251,115224. DOI: 10.1016/j.ejmech.2023.115224 PubMed ID: 36958177
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Abstract: The alarming increase in the resistance of bacteria to the currently available antibiotics necessitates the development of new effective antimicrobial agents that are active against bacterial pathogens causing major public health problems. For this purpose, our inhouse libraries were screened against a wide panel of clin. relevant Gram-pos. and Gram-neg. bacteria, based on which compound I was selected for further optimization. Synthetic efforts in a group of arylurea derivatives of aryloxy(1-phenylpropyl) alicyclic diamines, followed with an in vitro evaluation of the activity against multidrug-resistant strains identified compound 44 (1-(3-chlorophenyl)-3-(1-{3-phenyl-3-[3-(trifluoromethyl)phenoxy] propyl}piperidin-4-yl)urea). Compound 44 showed antibacterial activity against Gram-pos. bacteria including fatal drug-resistant strains i.e., Staphylococcus aureus (methicillin-resistant, MRSA; vancomycin-intermediate, VISA) and Enterococcus faecium (vancomycin-resistant, VREfm) at low concentrations (0.78-3.125 μg/mL) comparable to last resort antibiotics (i.e., vancomycin and linezolid). It is also potent against biofilm-forming S. aureus and Staphylococcus epidermidis (including linezolid-resistant, LRSE) strains, but with no activity against Gram-neg. bacteria (Escherichia coli, Klebsiella pneumoniae and Pseudomonas aeruginosa). Compound 44 showed strong bactericidal properties against susceptible and drug-resistant Gram-pos. bacteria. Depolarization of the bacterial cytoplasmic membrane induced by compound 44 suggests a dissipation of the bacterial membrane potential as its mechanism of antibacterial action. The high antimicrobial activity of compound 44, along with its selectivity over mammalian cells (lung MCR-5 and skin BJ fibroblast cell lines) and no hemolytic properties toward horse erythrocytes, proposes arylurea derivatives of aryloxy(1-phenylpropyl) alicyclic diamines for development of novel antibacterial agents.
Keywords: Arylurea derivatives ; Antibacterial properties ; Anti-MRSA activity ; Anti-VRE activity ; Anti-LRSE activity ; Depolarization of bacterial cell membrane
Purchased from AmBeed: 122536-76-9 ; 936-59-4 ; 135632-53-0 ; 404-71-7 ; 73874-95-0 ; 372-20-3 ; 98-17-9 ; 402-45-9 ; 57260-71-6 ; 122536-77-0 ; 444-30-4 ; 165800-03-3 ; 150-19-6 ; 1195-45-5 ; 2909-38-8 ; 165800-03-3 ...More
CAS No. : | 936-59-4 | MDL No. : | MFCD00000990 |
Formula : | C9H9ClO | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | KTJRGPZVSKWRTJ-UHFFFAOYSA-N |
M.W : | 168.62 | Pubchem ID : | 70295 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | 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 |
---|---|---|
98% | Present intermediate 3 was prepared in the same way as intermediate 14 of WO 2004/011436, i.e. according to Example A9 of WO 2004/011436, but starting from 3-chloropropiophenone. Yield: 98% of present intermediate 3 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
96% | With titanium tetrachloride; zinc; In 2-methyltetrahydrofuran; at 15 - 50℃;Product distribution / selectivity; | Hydroxyethoxybenzophenone (67.66g, 279.3 mmol, 1 eq), 3- chloropropiophenone (47.24 g, 279.3 mmol, 1 eq), zinc powder (69.45 g, 1062 mmol, 3.8 eq) and 2-methyltetrahydrofuran (895 g, 1041 ml) were charged to the reactor. The slurry was degassed and the vessel was filled with nitrogen gas. The slurry was cooled to <15C and then titanium tetrachloride (101.5 g, 535.1 mmol, 1.92 eq.) was slowly dosed maintaining a temperature below 20C. The slurry was heated to 50C and the temperature was maintained for 15 minutes. The slurry was heated to 70C and the pressure was reduced and 2- methyltetrahydrofuran (403 g) was distilled off at 70C and 650 mbar over 1 hour. Zinc(s) was filtered off and the filter was rinsed with 2-methyltetrahydrofuran (64 g). The pressure was reduced to 200 mbar and 2-methyltetrahydrofuran (344 g) was distilled off at 43-53C and 200-160 mbar pressure (total amount of pure 2- methyltetrahydrofuran recycled is 76%). Toluene (151g) was charged. A mixture of hydrochloric acid (aq) (116 g, 37 %) and water (281 g) was added maintaining a temperature below 20C. The lower aqueous phase was cut (at 30C) and discarded. Water (128 g) was added. The lower aqueous phase was cut (at 55C) and discarded. Water (131 g) was added again and the lower aqueous phase was cut again (at 55C) and discarded. The pressure was reduced and 2- methyltetrahydrofuran + toluene + water was distilled off at 150-50 bar and 37- 60C until there was a residual volume of about 130 ml. Before the crystallisation/precipitation process, the ratio of Z:E isomers of Ospemifene was about 5.5:1. Then, methanol (125 g) was charged and the solution was filtered. To the filtrate was added methanol to a total weight of 572 g (content estimated to 121 g raw product + toluene and 451 g methanol). Water (148 g) was added to the filtrate and the solution was heated to 50C. The solution was then cooled to 48C and seeded. The mixture was slowly cooled to 15C over 5 hours and maintained at this temperature overnight. The product was isolated by filtration and the filter cake was rinsed with methanol(aq) (74%, 141 g). Yield 50.4 g after drying (47.6%). Purity >99% by HPLC (standard). The raw product contained 98.81 % Z-isomer, 0.61% E-isomer (hence a Z:£ ratio of 162:1 ) and 0.58% of other products. The product obtained (in a yield of 96%; hence, advantageously yield is not significantly decreased) after recrystallisation was 99.9% Z-isomer, 0.05% E-isomer (hence a Z:E ratio of 1991 : 1 ) and 0.05% of other products. Hence, an extremely pure and selective Z-isomer of the compound of formula I is obtained by this method of the invention. |
With titanium tetrachloride; zinc; In 2-methyltetrahydrofuran; at -10 - 80℃; for 5.5h;Inert atmosphere; | Zn powder (172 g, 2.6 mol) was added to the 3 L reaction flask, respectively2-methyltetrahydrofuran (1800 mL),Stir well and cool to -10 C,Nitrile was slowly added, TiCl4 (250 g, 1.32 mol) was slowly added dropwise,Add to warm up to room temperature for 30min,And then heated to 80 C for 2 h.Cooling to 40 ,A solution of 2- (4-benzophenoxy) -1-ethanol (108 g, 0.45 mol) was added dropwise3-chlorophenylacetone (76 g, 0.45 mol)2-methyltetrahydrofuran solution (800 ml).Plus heating temperature to 80 under the reaction 3h,After TLC detection reaction is completed,React and cool the system temperature to room temperature |
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