On account of the reported anticancer of pyrimidine and condensed pyrimidine, a new pyrimido [3,2-b]-1,2,4,5-tetrazine 3(a,b), 5(c,d), 6, 9, pyrimido [3,2-b]-1,2,4-triazine 10, 11, pyrimido [3,2-b]-1,2,4-triazole 12 and pyrimidine derivatives 1,2(a,b), 4(c,d), 8, 13, 14, 15 and 16 were synthesized through different chemical reactions. Structures of all synthesized compounds were supported by spectral and elemental analyses. The obtained compounds were evaluated for their in vitro antitumor activity against human liver cancer cell line (HEPG2). (C) 2012 King Saud University. Production and hosting by Elsevier B. V. All rights reserved.