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Bailey, T.R. et al.

An evaluation of the antirhinoviral activity of acetylfuran replacements for 3-methylisoxazoles. Are 2-acetylfurans bioisosteres for 3-methylisoxazoles?

As a probe of the 3-methylisoxazole portion of our broad-spectrum antipicornaviral series, a panel of 2-acetylfuran analogues was prepared as replacements for the 3-methylisoxazole ring. Comparison of the two series showed remarkable similarity in potency, spectrum of activity, logP, and electrostatic parameters. X-ray studies of 21b bound to human rhinovirus-14 showed that the 2-acetyl group adopted a syn conformation and the carbonyl oxygen acts as a hydrogen bond acceptor with ASN219 in much the same way as the nitrogen of the isoxazole. The importance of the syn conformation and the hydrogen-bonding capability was confirmed by the reduced antiviral activity of the 2-methylfuran and 2-formylfuran analogues. From the results of this study, it is apparent that the syn-2-acetylfuran ring is acting as a bioisostere for the 3-methylisoxazole.[1]

References

An evaluation of the antirhinoviral activity of acetylfuran replacements for 3-methylisoxazoles. Are 2-acetylfurans bioisosteres for 3-methylisoxazoles? Bailey, T.R., Diana, G.D., Mallamo, J.P., Vescio, N., Draper, T.L., Carabateas, P.M., Long, M.A., Giranda, V.L., Dutko, F.J., Pevear, D.C. J. Med. Chem. (1994) [Pubmed]

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