25 P= 6-(2 4 6-M e, l P yd P= 4-12 4 6-Me, IP ya Key: py= pyridine or 2, 4, 6- trimethylpyridine; a= SnCl,, HC1; b= EtOCH= CHCOCI; c= HZS04. is depicted in Scheme IV. The pyridyl moiety was introduced at an early stage.(Nitrophenyl) pyridyl isomers6 were purified and used as building blocks for the elaboration of the quinolone nucleus following the sequence SnCl, reduction, anilide formation, and H $04 cyclization. As expected, m- ...