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PubMed · 11025316

Three leflunomide metabolite analogs.

S Ghosh·J D Jennissen·Y Zheng·F M Uckun
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Abstract

The title compounds, 1-cyano-2-hydroxy-N-[4-(methylsulfonyl)phenyl]but-2-enamide, C(12)H(12)N(2)O(4)S, PHI492, 1-cyano-2-hydroxy-N-[3-(methylsulfonyl)phenyl]but-2-enamide, C(12)H(12)N(2)O(4)S, PHI493, and N-[3-bromo-4-(trifluoromethoxy)phenyl]-1-cyano-2-hydroxybut-2-e namide , C(12)H(8)BrF(3)N(2)O(3), PHI495, are potent inhibitors of Bruton's tyrosine kinase (BTK). The molecular structures of these compounds are similar and they display similar hydrogen-bonding networks and crystal packing. Examination of the crystal-packing interaction in the three compounds reveals an alternating direction of adjacent molecules in the crystalline lattice due to intermolecular cyano-amide hydrogen bonding. PHI492, a positional isomer of PHI493, does not form intermolecular O-H.O hydrogen bonds between molecules and crystallizes in a space group different from that of PHI493 and PHI495. The aromatic ring and the amide group of each molecule form a conjugated pi-system which ensures planarity, with further stabilization gained from intramolecular O-H.O hydrogen bonds.

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Antineoplastic AgentsCrystallography, X-RayEnzyme InhibitorsHydrogen BondingIsoxazolesLeflunomideModels, MolecularMolecular ConformationProtein-Tyrosine KinasesJournal Article

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BibTeXRIS

S Ghosh, J D Jennissen, Y Zheng, F M Uckun. 2000. Three leflunomide metabolite analogs.. https://doi.org/10.1107/s0108270100009768

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