1-hydroxy-2-pyridones, a process for their preparation, and medicaments which contain them, and intermediates formed in the preparation of the 1-hydroxy-2-pyridones

Abstract From the Canadian patent

Abstract of the disclosure: New 1-hydroxy-2-pyridones of the general formula I in which, R1, R2 and R3, which are identical or different denote, hydrogen or lower alkyl having 1 - 4 carbon atoms R1 and R3 preferably being hydrogen, and R2 preferably being methyl, X denotes S or preferably, O, Y denotes hydrogen or up to 2 halogen atoms namely, chlorine and/or bromine, Z denotes a single bond or the bivalent radicals O S, -CR2- (R = H or C1-C4-alkyl) or other 2-valent radical with 2 - 10 carbon and, optionally oxygen, and/or sulfur atoms linked to form a chain it being, obligatory when the radicals contain 2 or more oxygen and/or sulfur atoms for the latter to be separated by at least 2 …