- Synthesis and growth-inhibitory activities of imidazo?5,1-d]-1,2,3,5-tetrazine-8-carboxamides related to the anti-tumour drug temozolomide, with appended silicon, benzyl and heteromethyl groups at the 3-position
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A series of 3-(benzyl-substituted)-imidazo?5,1-d]-1,2,3,5-tetrazines (13) and related derivatives with 3-heteromethyl groups has been synthesised and screened for growth-inhibitory activity in vitro against two pairs of glioma cell lines with temozolomide-sensitive and -resistant phenotypes dependent on the absence/presence of the DNA repair protein O6-methylguanine-DNA methyltransferase (MGMT). In general the compounds had low inhibitory activity with GI50 values >50 μM against both sets of cell lines. Two silicon-containing derivatives, the TMS-methylimidazotetrazine (9) and the SEM-analogue (10), showed interesting differences: compound (9) had a profile very similar to that of temozolomide with the MGMT+ cell lines being 5 to 10-fold more resistant than MGMT- isogenic partners; the SEM-substituted compound (10) showed potency across all cell lines irrespective of their MGMT status.
- Cousin, David,Hummersone, Marc G.,Bradshaw, Tracey D.,Zhang, Jihong,Moody, Christopher J.,Foreiter, Magdalena B.,Summers, Helen S.,Lewis, William,Wheelhouse, Richard T.,Stevens, Malcolm F.G.
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supporting information
p. 545 - 553
(2018/03/28)
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- 3-SUBSTITUTED-4-OXO-3,4-DIHYDRO-IMIDAZO-[5,1-D][1,2,3,5-TETRAZINE-8-CARBOXYLIC ACID AMIDES AND THEIR USE
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The present invention pertains generally to the field of therapeutic compounds, and more specifically to certain 3-substituted-4-oxo-3,4-dihydro-imidazo[5,1-d][1,2,3,5]tetrazine-8-carboxylic acid amide (collectively referred to herein as 3TM compounds). The present invention also pertains to pharmaceutical compositions comprising such compounds, and the use of such compounds and compositions, both in vitro and in vivo, to inhibit cell proliferation, and in the treatment of proliferative disorders such as cancer, etc., and methods of preparing such compounds.
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Page/Page column 96
(2009/07/18)
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- Compounds useful in therapy
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Compounds of formula (I), or pharmaceutically acceptable derivatives thereof, wherein: X represents —[CH2]a—R or —[CH2]a—O—[CH2]b—R; a represents a number selected from 0 to 6; b represents a number selected from 0 to 6; R represents H, CF3 or Het; Het represents an optionally substituted 5- or 6-membered saturated, partially saturated or aromatic heterocyclic ring; Y represents one or more substituents independently selected from —[O]c—[CH2]d—R1, which may be the same or different at each occurrence; c at each occurrence independently represents a number selected from 0 or 1; d at each occurrence independently represents a number selected from 0 to 6; R1 at each occurrence independently represents H, halo, CF3, CN or Het1; Het1 at each occurrence independently represents a 5- or 6-membered unsaturated heterocyclic ring; V represents a direct link or —O—; Ring A represents an optionally substituted 5- to 7-membered saturated heterocyclic ring, or a phenylene group; Q represents a direct link or —N(R2)—; R2 represents hydrogen or C1-6 alkyl; Z represents —[O]e—[CH2]f—R3, a phenyl ring (optionally fused to a benzene ring or Het2, and the group as a whole being optionally substituted), or Het3 (optionally fused to an benzene ring or Het4, and the group as a whole being optionally substituted); R3 represents C1-6 alkyl (optionally substituted), C3-6 cycloalkyl, C3-6 cycloalkenyl, phenyl (optionally substituted), Het5 or NR4R5; e represents a number selected from 0 or 1; f represents a number selected from 0 to 6; Het2 and Het5 independently represent optionally substituted 5- or 6-membered saturated, partially saturated or aromatic heterocyclic rings; Het3 represents an optionally substituted 4 to 6-membered saturated, partially saturated or aromatic heterocyclic ring; Het4 represents an optionally substituted 6-membered aromatic heterocyclic ring; R4 and R5 independently represent optionally substituted C1-6 alkyl, C1-6 alkyloxy, C3-8 cycloalkyl (optionally fused to C3-8 cycloalkyl), Het6, or hydrogen; Het6 represents an optionally substituted 5- or 6-membered saturated, partially saturated or aromatic heterocyclic ring; are useful for treating a disorder for which a V1a antagonist is indicated.
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Page/Page column 27
(2010/02/12)
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