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Synthesis 1991; 1991(11): 982-984
DOI: 10.1055/s-1991-26623
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A Convenient Synthetic Methodology for the Elaboration of the Pyrido[2,3-b]-or [3,4-b]-pyrazine and [1,4]diazepine Skeletons

Axel Couture* , Pierre Grandclaudon
  • *Laboratoire de Chimie Organique Physique, URA CNRS No 351, Université des Sciences et Techniques de Lille Flandres-Artois, F-59655 Villeneuve d'Ascq Cédex, France
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Publication Date:
29 April 2002 (online)

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The condensation of the anion of 3-(formylamino)-2-chloropyridines, 3-(acetylamino)-2-chloro-, -4-chloro- or -2,4-dichloropyridines with various chloro-N,N-dimethylalkylamines gives rise efficiently to 1,2,3, 4-tetrahydropyrido[2,3-b]- or [3,4-b]- pyrazines and to 2,3,4, 5-tetrahydro-1H-pyrido[2,3-b]- or [3,4-b]-[1,4]diazepines.