... Volume: Page: ... The final compounds were all synthesized through the 3-substituted 6-chloro-7,8,9,10-tetrahydro-7,10-ethano-1,2,4-triazolo[3,4-a]phthalazines (101a ... reflux, 4 d; (iv) NH 2 NH 2 ·H 2 O, EtOH, reflux, 18 h; (v) R 1 COCl, Et 3 N, CHCl 3 , rt, 4−24 h; (vi ...