The scope of thallium nitrate oxidative cyclization of chalcones; synthesis and evaluation of isoflavone and aurone analogs for their inhibitory activity against interleukin-5 |
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Authors: | P Thanigaimalai Hyun-Mo Yang Vinay Kumar Sharma Youngsoo Kim Sang-Hun Jung |
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Institution: | 1. College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 305-764, Republic of Korea;2. College of Pharmacy, Chungbuk National University, Cheongju 361-763, Republic of Korea |
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Abstract: | The oxidative cyclization of 2′-hydroxy-6′-cyclohexylmethoxychalcones 5 using thallium (III) nitrate (TTN) in alcoholic solvents produced isoflavones 2 and (or) aurones 3 depending on the electronic nature of p-substituents on ring B. Chalcones with strong electron donating substituents (OH, OCH3) were exclusively converted to isoflavones 2. Chalcone with weak electron donating substituents (CH2CH3) was transformed into isoflavone 2 and the aurone 3 in approximate ratio 1:1. Chalcones with hydrogen or electron withdrawing substituents (Cl, CHO, COOCH3, and NO2) formed aurones 3. Synthesized isoflavones 2 and aurones 3 were evaluated for their inhibitory activity against interleukin-5. Among them, 5-(cyclohexylmethoxy)-3-(3,4,5-trimethoxyphenyl)-4H-chromen-4-one (2h, >100% inhibition at 50 μM, IC50 = 6.1 μM) gave most potent activity. All the aurones 3 were inactive. |
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