Antibacterial activity of quinoxalines, quinazolines, and 1,5-naphthyridines

X = phenyl, 4-fluorophenyl, 3- or 4-t-butylphenyl, 3-biphenyl or 5-carboxy -3-biphenyl, Y = CH2NC(NH2)2, X1 = 4-t-butylphenyl or CH2NC(NH2)2, Y1 = CH2NH2, CH2NC(NH2)2, or 4-t-butylphenyl