Chemistry of thienopyridines. XXXVII. Syntheses in the cyclopenta,cyclohexa-, and cycloheptathieno[2,3-b]pyridine series. Three analogs of 9-amino-1,2,3,4-tetrahydroacridine

4-Aminocyclopenta-, 4-aminocyclohexa-, and 4-aminocycloheptathieno[2,3-b]pyridines were synthesized in very low overall yield by four-step procedures starting from bis(2-thienylammonium) hexachlorostannate(IV) and 2-hydroxymethylenecyclopentanone, 2-methoxymethylenecyclohexanone, and 2-hydroxymethylenecycloheptanone, respectively.