Synthesis and biological evaluation of N-arylbenzo[b]thieno[3,2-d]pyrimidin-4-amines and their pyrido and pyrazino analogues as Ser/Thr kinase inhibitors

Eur J Med Chem. 2012 Dec;58:171-83. doi: 10.1016/j.ejmech.2012.10.006. Epub 2012 Oct 16.


A useful and rapid access to libraries of N-arylbenzo[b]thieno[3,2-d]pyrimidin-4-amines and their pyrido and pyrazino analogues was designed and optimized for the first time via microwave-accelerated condensation and Dimroth rearrangement of the starting anilines with N'-(2-cyanoaryl)-N,N-dimethylformimidamides obtained by reaction of thiophene precursors with dimethylformamide dimethylacetal. The inhibitory potency of the final products against five protein kinases (CDK5/p25, CK1δ/ɛ, GSK3α/β, DYRK1A and CLK1) was estimated. N-arylpyrido[3',2':4,5]thieno[3,2-d]pyrimidin-4-amine series of compounds (4a-j) turned out to be particularly promising for the development of new pharmacological inhibitors of CK1 and CLK1 kinases.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Dose-Response Relationship, Drug
  • Humans
  • Molecular Structure
  • Protein Kinase Inhibitors / chemical synthesis
  • Protein Kinase Inhibitors / chemistry
  • Protein Kinase Inhibitors / pharmacology*
  • Protein-Serine-Threonine Kinases / antagonists & inhibitors*
  • Protein-Serine-Threonine Kinases / metabolism
  • Pyrazines / chemistry*
  • Pyridones / chemistry*
  • Pyrimidines / chemical synthesis
  • Pyrimidines / chemistry
  • Pyrimidines / pharmacology*
  • Rats
  • Structure-Activity Relationship
  • Swine
  • Thiophenes / chemical synthesis
  • Thiophenes / chemistry
  • Thiophenes / pharmacology*


  • Protein Kinase Inhibitors
  • Pyrazines
  • Pyridones
  • Pyrimidines
  • Thiophenes
  • Protein-Serine-Threonine Kinases