Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...
Reexamination Certificate
2002-07-18
2004-08-31
Lambkin, Deborah C. (Department: 1626)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Having -c-, wherein x is chalcogen, bonded directly to...
C514S252010, C548S195000, C544S238000
Reexamination Certificate
active
06784198
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to arylmethyl-carbonylaminothiazole derivatives and, more specifically relates to 2-(arylmethyl-carbonylamino)-1,3-thiazole derivatives, to a process for their preparation, to pharmaceutical compositions containing them, and to their use as therapeutic agents, particularly in the treatment of cancer and cell proliferative disorders.
2. Background of the Invention
Several cytotoxic drugs such as, e.g. fluorouracil (5-FU), doxorubicin and camptothecins, cause damage DNA or affect cellular metabolic pathways and thus cause, in many cases, an indirect block of the cell cycle. Therefore, by producing an irreversible damage to both normal and tumor cells, these agents result in a significant toxicity and side-effects.
In this respect, compounds capable of being highly specific antitumor agents by selectively leading to tumor cell arrest and apoptosis, with comparable efficacy but reduced toxicity than the currently available drugs, are desirable.
It is well known that progression through the cell cycle is governed by a series of checkpoint controls, otherwise referred to as restriction points, which are regulated by a family of enzymes known as the cyclin-dependent kinases (cdk).
In their turn, the cdks themselves are regulated at many levels such as, for instance, binding to cyclins.
The coordinated activation and inactivation of different cyclin/cdk complexes is necessary for normal progression through the cell cycle. Both the critical G1-S and G2-M transitions are controlled by the activation of different cyclin/cdk activities. In G1, both cyclin D/cdk4 and cyclin E/cdk2 are thought to mediate the onset of S-phase. Progression through S-phase requires the activity of cyclin A/cdk2 whereas the activation of cyclin A/cdc2 (cdkl) and cyclin B/cdc2 are required for the onset of metaphases. For a general reference to cyclins and cyclin-dependent kinases see, for example, Kevin R. Webster et al. in Exp. Opin. Invest. Drugs, 1998, Vol. 7(6), 865-887.
Checkpoint controls are defective in tumor cells due, in part, to disregulation of cdk activity. For example, altered expression of cyclin E and cdk's has been observed in tumor cells, and deletion of the cdk inhibitor p27 KIP gene in mice has been shown to result in a higher incidence of cancer.
Increasing evidence supports the idea that the cdks are rate-limiting enzymes in cell cycle progression and, as such, represent molecular targets for therapeutic intervention. In particular, the direct inhibition of cdk/cyclin kinase activity should be helpful in restricting the unregulated proliferation of a tumor cell.
SUMMARY OF THE INVENTION
It is an object of the invention to provide compounds which are useful in treating cell proliferative disorders associated with an altered cell dependent kinase activity. It is another object to provide compounds which have cdk/cyclin kinase inhibitory activity.
It is another object of the invention to provide compounds which are useful in therapy as antitumor agents but lack, in terms of both toxicity and side effects, the drawbacks associated with currently available antitumor drugs discussed above.
The present inventors have now discovered that 2-amino-1,3-thiazole derivatives are endowed with cdk/cyclin kinase inhibitory activity and are thus useful in therapy as antitumor agents and lack, in terms of both toxicity and side effects, the aforementioned drawbacks associated with currently available antitumor drugs.
More specifically, the compounds of this invention are useful in the treatment of a variety of cancers including, but not limited to: carcinoma such as bladder, breast, colon, kidney, liver, lung, including small cell lung cancer, esophagus, gall-bladder, ovary, pancreas, stomach, cervix, thyroid, prostate, and skin, including squamous cell carcinoma; hematopoietic tumors of lymphoid lineage, including leukemia, acute lymphocytic leukemia, acute lymphoblastic leukemia, B-cell lymphoma, T-cell-lymphoma, Hodgkin's lymphoma, non-Hodgkin's lymphoma, hairy cell lymphoma and Burkett's lymphoma; hematopoietic tumors of myeloid lineage, including acute and chronic myelogenous leukemias, myelodysplastic syndrome and promyelocytic leukemia; tumors of mesenchymal origin, including fibrosarcoma and rhabdomyosarcoma; tumors of the central and peripheral nervous system, including astrocytoma, neuroblastoma, glioma and schwannomas; other tumors, including melanoma, seminoma, teratocarcinoma, osteosarcoma, xenoderoma pigmentosum, keratoctanthoma, thyroid follicular cancer and Kaposi's sarcoma.
Due to the key role of cdks in the regulation of cellular proliferation, the 2-amino-1,3-thiazole derivatives are also useful in the treatment of a variety of cell proliferative disorders such as, for instance, benign prostate hyperplasia, familial adenomatosis polyposis, neuro-fibromatosis, psoriasis, vascular smooth cell proliferation associated with atherosclerosis, pulmonary fibrosis, arthritis glomerulonephritis and post-surgical stenosis and restenosis.
The compounds of the invention can be useful in the treatment of Alzheimer's disease, as suggested by the fact that cdk5 is involved in the phosphorylation of tau protein (
J. Biochem
., 17, 741-749, 1995).
The compounds of this invention, as modulators of apoptosis, could be useful in the treatment of cancer, viral infections, prevention of AIDS development in HIV-infected individuals, autoimmune diseases and neurodegenerative disorder.
The compounds of this invention may also be useful in inhibiting tumor angiogenesis and metastasis.
The compounds of this invention may also act as inhibitors of other protein kinases, e.g. protein kinase C, her2, rafl, MEKI, MAP kinase, EGF receptor, PDGF receptor, IGF receptor, P13 kinase, weel kinase, Src, Abl and thus be effective in the treatment of diseases associated with other protein kinases.
Accordingly, the present invention provides a method for the treatment of cell proliferative disorders associated with an altered cell dependent kinase activity, by administering to a mammal in need thereof an effective amount of a 2-amino-1,3-thiazole represented by formula (I) or (II):
where
L is a phenyl group or a 5 or 6 membered aromatic heterocycle with one or more heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur;
R is (i) a halogen atom, a nitro group, or it is selected from the group consisting of pyrrolidino, morpholino, piperazino, N-alkyl piperazino, N-aryl-piperazino, N-arylalkyl-piperazino, piperidino and azabicyclo[3.2.2]nonane; or
(ii) an amino group optionally further substituted with one or more groups, which may be the same or different, selected from the group consisting of alkyl, aryl, arylalkyl, alkylsulphonyl, arylsulphonyl, arylalkylsulphonyl, alkylcarbonyl, arylcarbonyl, and arylalkylcarbonyl, wherein the alkyl moieties therein are optionally further substituted with one or more hydroxy or amino groups; or
(iii) a C
3
-C
6
cycloalkyl optionally substituted with a straight or branched C
1
-C
6
alkyl group; or
(iv) a straight or branched C
1
-C
6
alkyl group or an arylalkyl group which is optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, carboxy, hydroxy, nitro, alkylthio, alkoxy, straight or branched C
1
-C
6
alkyl, arylthio, aryloxy, amino, alkylamino, dialkylamino, arylamino, arylalkylamino, hydroxyaminocarbonyl, alkoxyaminocarbonyl, C
2
-C
4
alkenyl, C
2
-C
4
alkynyl, C
3
-C
6
cycloalkyl, alkyl-C
3
-C
6
cycloalkyl, alkylcarbonyl, arylcarbonyl, arylalkylcarbonyl, alkylsulphonyl, arylsulphonyl, arylalkylsulphonyl, aminosulphonyl, alkylaminosulphonyl, dialkylaminosulphonyl, alkylcarbonylamino, arylalkylcarbonylamino, arylaminosulphonyl, arylalkylaminosulphonyl, arylcarbonylamino, alkylsulphonylamino, arylsulphonylamino, arylalkylsulphonylamino, alkoxycarbonyl, aryloxycarbonyl, aminocarbonyl, alkylaminocarbonyl, arylaminocarbonyl, dialkylaminocarbonyl, arylalkylaminocarbonyl, pyrrolidino, morpholin
Amici Raffaella
Pevarello Paolo
Salom Barbara
Varasi Mario
Villa Manuela
Lambkin Deborah C.
Pharmacia Italia S.p.A.
Scully Scott Murphy & Presser
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