Thiazolopyridine analogs of nalidixic acid. 2. Thiazolo[4,5-b]pyridines

A series of 2‐substituted 4‐ethyl‐4,7‐dihydro‐7‐oxothiazolo[4,5‐ b ]pyridine‐6‐carboxylic acids were synthesized. Antibacterial activity was tested in vitro . None of the new compounds prepared showed any interesting antibacterial activity in vitro against the strains tested.