Antitumor imidazotetrazines. 14. Synthesis and antitumor activity of 6- and 8-substituted imidazo[5,1-d]-1,2,3,5-tetrazinones and 8-substituted pyrazolo[5,1-d]-1,2,3,5-tetrazinones
摘要:
The systematic variation of the potent antitumor agent mitozolomide (1) is extended to cover alteration of substituents at positions 6 and 8 and to change the imidazo[5,1-d]-1,2,3,5-tetrazinone (1) skeleton to the isomeric pyrazolo-[5,1-d]-1,2,3,5-tetrazinone (17) skeleton. The series of eight 6-alkyl and 6-aralkyl derivatives of 1 showed optimal antitumor activity when the group was small or linear, but activity diminished as size and branching of this substituent increased. This may reflect altered transport characteristics, or failure of the enlarged derivatives to fit a binding site, or possibly a reduced tendency for the derivatives having bulky groups at position 6 to hydrolytically generate the putatively active triazenes (21). Testing of 14 derivatives of 1 differently substituted at position 8 revealed a complex structure-activity relationship, with good antitumor activity obtained for carbamoyl and sulfamoyl groups bearing small substituents. The 8-methylsulfonyl compound had noteworthy activity, but the 8-cyano, 8-nitro, and 8-phenyl derivatives were devoid of useful antitumor activity in these tests. From the limited number of pyrazolotetrazinones (17) reported here, it is suggested that the same conclusions as regards activity also hold true for this ring system.
3-Haloethyl-4-oxopyrazolo (5,1-d)-1,2,3,5-tetrazine-8-carboxamide and process for their production and use
申请人:WARNER-LAMBERT COMPANY
公开号:EP0127028A2
公开(公告)日:1984-12-05
The title compounds are provided as well as a method for their production, pharmaceutical compositions comprising the compounds, and a method of treatment using the compounds in dosage form. Compounds of the invention have pharmacological properties and are useful antimicrobial agents and antileukemic agents.
Pyrazole derivatives. 5. Synthesis and antineoplastic activity of 3-(2-chloroethyl)-3,4-dihydro-4-oxopyrazolo[5,1-d]-1,2,3,5-tetrazine-8-carboxamide and related compounds
作者:C. C. Cheng、Edward F. Elslager、Leslie M. Werbel、Wilbur R. Leopold
DOI:10.1021/jm00158a041
日期:1986.8
Two pyrazolotetrazine derivatives were synthesized as the analogous prodrugs of the light-sensitive antineoplastic agents dacarbazine and BIC. Both the pyrazole derivatives are stable under ordinary light illumination. Biological evaluation of these pyrazoles revealed that the compound containing a 2-chloroethyl function (6a) demonstrated good antineoplastic activity in experimental animals, but the one containing a methyl function (6b) was inactive. The inactivity of compound 6b may suggest that compound 6a and related imidazotetrazines may simply act as biological alkylating agents per se rather than as prodrugs. The information could also imply that the postulated dealkylation mechanism for the triazene derivatives should be reexamined.
CHENG, CHIA-CHUNG
作者:CHENG, CHIA-CHUNG
DOI:——
日期:——
CHENG, CHIA, C.
作者:CHENG, CHIA, C.
DOI:——
日期:——
CHENG C. C.; ELSLAGER E. F.; WERBEL L. M.; PRIEBE S. R.; LEOPOLD W. R., J. MED. CHEM., 29,(1986) N 8, 1544-1547
作者:CHENG C. C.、 ELSLAGER E. F.、 WERBEL L. M.、 PRIEBE S. R.、 LEOPOLD W. R.