PIPERAZINEDIONE COMPOUNDS

摘要

Piperazinedione compounds (I) are new. Piperazinedione compounds of formula(I) are new. [Image] a and b : single or double bond; A : H, CH(RaRb) or C(RaRb); Z : R 3O-(Ar)-B or C(Rc); B : CH(Rc); Ar : heteroaryl; R 3H, alkyl, (hetero)aryl, C(O)Rd, C(O)ORd, C(O)NRdRe or SO 2Rd; R 1 and R 2H, C(O)Rd, C(O)ORd, C(O)NRdRe or SO 2Rd; Ra, Rb, Rc, Rd and Re : H, alkyl, (hetero)aryl or (hetero)cyclyl; optionally Ra+Rb, R 1+Ra and R 1+Rb : (hetero)cyclyl. provided that when b is a single bond, then A is H or CH(RaRb) or when b is a double bond, then A is C(RaRb) and when a is a single bond then Z is R 3O-(Ar)-B and when a is a double bond, Z is C(Rc). An independent claim is also included for treating tumor, involving administering a piperazinedione compound of formula (II) to a subject. [Image] Z' : CH(R cR d) or C(R cR d); R 1> and R 2>H, C(O)Re, C(O)ORe, C(O)NReRf or SO 2Re; R c, R d, Re and Rf : Ra; R 1>+Ra and R 1>+Rb : (hetero)cyclyl. When a is a single bond then Z' is CH(R cR d) and when a is a double bond, Z' is C(R cR d). Provided that if a is a single bond and b is a double bond, then one of R c and R d is H and other is heteroaryl. ACTIVITY : Cytostatic. The cytotoxic activities of (I) and taxol were tested on PC-3 cells. Cells were incubated in the presence of (I) in a serum-free medium for 24 hours. The cytotoxic activities were determined by the MTT assay. All compounds were active. The most potent (I) had an EC 5 0 value of about 0.3 micromolar, which is 30 times more potent than taxol. MECHANISM OF ACTION : Inhibitor of G 2/M progression of the cell cycle; Inhibitor of endothelial cell proliferation and angiogenesis effect; Inhibitor of polymerization of tubulin/microtubulin. Tubulin/microtubulin was incubated in the presence of (I) at a different concentrations in a solution (0.1 M MES, 1 mM EGTA, 0.5 mM MgCl 2, 0.1 mM EDTA and 2.5 M glycerol) at 37[deg]C. Then GTP was added to induce polymerization of tubulin/microtubulin. Optical density was measured at 350 nm at various time points to determine the degree of the polymerization. (I) inhibits the polymerization at 10 -> 6> - 10 -> 5> M.