Quinoxaline-2,3-diones with an azaheterocyclic fused ring

摘要

Aza-aliphatically bridged quinoxaline-2,3-dione cpds. of formula (I) and their salts are new. A1 = lower alkylidene or CH-A4-R4; A2 = lower alkylidene, CH-A4-R4, CO or CH(OH)-A5-R4; A3 = N-A6-R5; A4 = lower alkylene; A5, A6 = lower alkylene or a direct bond; n = 0 or 1; R1,R2 = H, unsubstd. or lower alkyl- and/or lower alkanoyl-substd. amino, NO2, lower alkanoyl, free or etherified hydroxy, free or esterified carboxy, carbamoyl, CN, unsubstd. or halogenated lower alkyl or halogen; R3 = H or OH; R4 = free or esterified or amidated carboxy, free or esterified phosphono or 5-tetrazolyl; R5 = H, lower alkyl, lower alkenyl, lower alkynyl, aryl, lower alkanoyl, free or esterified or amidated carboxy, CN, 5-tetrazolyl, free or etherified or esterified hydroxy or dihydroxy-lower alkyl.