Synthesis of Several New S-Substituted Thiopyridines, Thieno[2,3-b ]pyridine, Pyrido[ 3,',2 ':4,5 ]thieno[ 3,2-d]pyrimidine and Pyrido[3 ',2 ':4,5 ]thieno[ 3,2-d][1,2,3 ]triazines Containing Sulfonamido Moieties