Abstract: The thieno[2,3-b]pyridines of general formula (I), wherein R1 is Me, C6H5, 3,4,5-(OMe)3C6H2, NH2; R2 is H, CN, COMe, COOC1-4alkyl, COOC2H4OMe, COOC2H4OPr(n); R3 is C6H4R6, 3,4-OCH2O—C6H3; 2-furanyl; R6 is 4-Cl, 4-NO2, 4-N(C1-4alkyl)2, 3-(C1-4alkyloxy), 4-(C1-4alkyloxy), 3,4-(C1-4alkyloxy)2, 3,4,5-(C1-4alkyloxy)3; R4 is NH2, NHCOMe; R5 is CN, COMe, COC6H4R7; CO-(2-naphthyl); R7 is H, 4-F, 4-Cl, 3-OMe, 4-OMe, 2,4-(OMe)2, 3,4,5-(OMe)3 as multidrug resistance modulators to increase the effectiveness of chemotherapy in cancer treatment.

Abstract: The thieno[2,3-b]pyridines of general formula (I), wherein R1 is Me, C6H5, 3,4,5-(OMe)3C6H2, NH2; R2 is H, CN, COMe, COOC1-4alkyl, COOC2H4OMe, COOC2H4OPr(n); R3 is C6H4R6, 3,4-OCH2O—C6H3; 2-furanyl; R6 is 4-Cl, 4-NO2, 4-N(C1-4alkyl)2, 3-(C1-4alkyloxy), 4-(C1-4alkyloxy), 3,4-(C1-4alkyloxy)2, 3,4,5-(C1-4alkyloxy)3; R4 is NH2, NHCOMe; R5 is CN, COMe, COC6H4R7; CO-(2-naphthyl); R7 is H, 4-F, 4-Cl, 3-OMe, 4-OMe, 2,4-(OMe)2, 3,4,5-(OMe)3 as multidrug resistance modulators to increase the effectiveness of chemotherapy in cancer treatment.

Abstract: The present invention discloses amphiphilic 1,4-dihydropyridine derivatives useful for the preparation of a composition for delivering nucleotide containing compounds into a target cell and/or its nucleus. Said composition comprises 1,4-dihydropyridine derivatives having a good DNA condensing capacity and capability of self-association. Also disclosed are composition comprising said derivatives complexed with nucleotide containing compounds as well methods for the producing of said complexes. The invention is also related to the use of said 1,4-dihydropyridine derivatives for manufacturing systems for delivering nucleotide containing compounds useful in gene therapy and DNA vaccination.