Abstract
Abstract The macrocyclic Schiff bases 20 – 25 were prepared by cyclocondensation of the bis aldehydes 12 – 15 with the appropriate diaminoalkanes 17 – 19 . Reduction of the latter with NaBH 4 afforded the corresponding azacrown ethers 27 – 30 . Heating of the aldehydes 12 – 16 in refluxing acetic acid afforded the corresponding 2,3-bis(benzofuranyl)quinoxalines 33 – 37 . Nucleophilic reaction of the bis phenols 45 – 48 , 54 , 56 , 57 with the appropriate dihalo compounds 1 , 38 afforded the corresponding macrocyclic diamides 49 – 52 and 1,ω-bis[quinoxalino(2,3- b )benzoxazepino-13-on-yl]alkanes 60 , 61 , respectively.
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