Patent number: 4080503
Abstract: Compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2, which may be identical to or different from each other, are each hydrogen, chlorine, bromine or alkyl of 1 to 3 carbon atoms,R.sub.3 is hydrogen, furfuryl, hydroxyethyl, .beta.-hydroxy-phenethyl, monochlorophenyl-ethyl, dichlorophenyl-ethyl, N-ethyl-piperidyl or --A--NR.sub.6 R.sub.7,whereA is alkylene of 1 to 5 carbon atoms, andR.sub.6 and R.sub.7 are alkyl of 1 to 2 carbon atoms or, together with each other and the nitrogen atom to which they are attached, form a heterocycle selected from the group consisting of pyrrolidino, morpholino, piperazino or N'-dimethylphenyl-piperazino,R.sub.4 is hydrogen or, together with R.sub.3 and the nitrogen to which they are attached, forms a heterocycle selected from the group consisting of piperidino, morpholino, dimethyl-morpholino or N'-methyl-piperazino,R.sub.5 is hydrogen, alkyl of 1 to 3 carbon atoms, hydroxy-ethyl, diethylamino-ethyl or furfuryl,Provided, however, that R.sub.1 and R.sub.
Type:
Grant
Filed:
July 16, 1973
Date of Patent:
March 21, 1978
Assignee:
Boehringer Ingelheim GmbH
Inventors:
Werner Kummer, Herbert Koppe, Helmut Stahle, Walter Haarmann