2-homopiperazine-1-yl-4H-l, 3 -bensothiazine-4-one derivatives of formula (I) are provided. They are useful in the treatment of bacterial infections, in particular tuberculosis, buruli ulcer and leprosy. A process for the preparation of 2- (homo)piperazine 1, 3-benzothiazine-4-one hydrochlorides is also provided.