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New 3-aryl-pyrido[2,1- b ][1,3]benzothiazole derivatives  2a – e  were synthesized in excellent yields  via  the reaction of benzothiazoleacetonitrile ( 1 ) with different aromatic aldehydes. The treatment of 2-(benzo[ d ]thiazol-2-yl)-3-(pyridin-4-yl)acrylonitrile ( 6 ) with malononitrile afforded 1-amino-3-(pyridin-4-yl)-3 H -pyrido[2,1- b ][1,3]benzothiazole-2,4-dicarbonitrile ( 7 ), which was allowed to react with a variety of reagents to provide pyrimido[5′,4′:5,6]pyrido[2,1- b ][1,3]benzothiazole  8 ,  9  and [1,3]benzothiazolo[3,2- a ][1,8]naphthyridine  10 ,  15  derivatives. All synthesized products were confirmed by elemental analysis, IR,  1 H-NMR,  13 C-NMR, and mass spectral data.

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Efficient and convenient synthesis of pyrido [2,1- b ]benzothiazole, pyrimidopyrido[2,1- b ]benzothiazole and benzothiazolo[3,2- a ][1,8]naphthyridine derivatives