作者:Sutapa Ghosh、Jason D. Jennissen、Yaguo Zheng、Fatih M. Uckun
DOI:10.1107/s0108270100009768
日期:2000.10.15
The title compounds, 1-cyano-2-hydroxy-N-[4-(methylsulfonyl)phenyl]but-2-enamide, C12H12N2O4 S, PHI492, 1-cyano-2-hydroxy-N-[3-(methylsulfonyl)phenyl]but-2-enamide, C12H12N2O4S, PHI493, and N-[3-bromo-4-(trifluoromethoxy)phenyl]-1-cyano-2-hydroxybut-2-enamide, C12H8BrF3N2O3, 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.