| abstract |
A compound of the formula, in which ring A is a condensed ring of 5-7 links, saturated or unsaturated, in which zero to two of the links in the ring are heteroatoms independently selected from nitrogen, oxygen and sulfur, with the condition that two adjacent ring members cannot be heteroatoms; X is oxygen or a bond; n is an integer from two to six; and R1 and R2 are independently selected from (C1-C6) alkyl, aryl, tetrahydronaphthalene and aralkyl, wherein said aryl and aryl radical of said aralkyl is phenyl or naphthyl, and the alkyl moiety is linear or branched and contains 1 to 6 carbon atoms, and in which said (C1-C6) alkyl, said aryl, said tetrahydronaphthalene and the aryl moiety of said aralkyl may be optionally substituted with one to three substituents, independently selected from halo, nitro , hydroxy, cyano, amino, (C1-C4) alkoxy and ((C1-C4) alkyl; or R1 and R2 form, together with the nitrogen to which they are attached, a piperazine ring, azetidine, piperidine or pyrrolidine or a ring Azabicyclic containing 6 to 14 links, 1 to 3 of which are nitrogen and the rest of which are carbon. |