... yl]methyleneoxyphenyljpiperazines Salma M. Abdelaal, Suk-Bin Kong and Ludwig Bauer* Department of Medicinal Chemistry and Pharmacognosy ... 1069 J. Heterocyclic Chem., 29, 1069 (1992 ... of acidic conditions were quite un- NH, 0,N-\ /?~ 16 18 NH2 X" 17 \J-" 19 successful ...