A new series of 2,3,5,7-substituted-pyrido[2,3-d]pyrimidin-4(3H)-onederivatives were prepared from 2-amino-N,6-substituted phenyl-4-(trifluoromethyl or methyl)nicotinamides. The key intermediate 2-amino-N,6-substituted phenyl-4-(trifluoromethyl or methyl)nicotinamides were synthesized from 2-bromo-N,6-disubstituted phenyl-4-(trifluoromethyl or methyl)nicotinamides as well as from ethyl-3-(3-dimet
Palladium‐Catalyzed Direct Carbonylation of Bromoacetonitrile to Synthesize 2‐Cyano‐
<i>N</i>
‐acetamide and 2‐Cyanoacetate Compounds
作者:Zhi‐Peng Bao、Xiao‐Feng Wu
DOI:10.1002/anie.202301671
日期:——
A new and convenientpalladium-catalyzed carbonylative procedure of bromoacetonitrile has been developed. A variety of valuable 2-cyano-N-acetamide and 2-cyanoacetate compounds were obtained in good to excellent yields under mild reaction conditions. Furthermore, this transformation can be carried out under atmospheric pressure and provides an alternative route to 7 drug compounds.
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.