URACIL DERIVATIVES, AND ANTITUMOR EFFECT POTENTIATOR AND ANTITUMOR AGENT CONTAINING THE SAME

摘要

Provided are a uracil derivative represented by the following formula (1): <CHEM> wherein R<1> represents a chlorine, bromine or iodine atom or a cyano or lower alkyl group; and R<2> represents a 4-8 membered heterocyclic group having 1-3 nitrogen atoms, which may be substituted by one or more lower alkyl, imino, hydroxyl, hydroxymethyl, methanesulfonyloxy, amino or nitro groups; an amidinothio group, one or more of the hydrogen atom(s) on one or both of the nitrogen atoms of which may each be substituted by a lower alkyl group; a guanidino group, one or more of the hydrogen atom(s) on one, two or all of the nitrogen atoms of which may each be substituted by a lower alkyl or cyano group; a (lower alkyl)amidino group; an amino group, one or both of the hydrogen atoms on the nitrogen atom of which may each be substituted by a lower alkyl group; a group -CH2N(R<a>)R<b> in which R<a> and R<b> may be the same or different and each represents a hydrogen atom or a lower alkyl group or R<a> and R<b> may form a pyrrolidine ring together with the nitrogen atom to which R<a> and R<b> are bonded; a group -NH-(CH2)m-Z in which Z represents an amino group, one or both of the hydrogen atoms on the nitrogen atom of which may each be substituted by a lower alkyl group, or a cyano group, and m stands for an integer of from 0 to 3; a group NR<c)<CH2)n-OH in which R<c> represents a hydrogen atom or a lower alkyl group, and n stands for a natural number of from 1 to 4; a group -X-Y in which X represents S or NH, and Y represents a 2-imidazolin-2-yl, 2-imidazolyl, 1-methylimidazol-2-yl, 1,2,4-triazol-3-yl, 2-pyrimidyl or 2-benzimidazolyl group which may be substituted by one or more lower alkyl groups; or a ureido or thioureido group, one or more of the hydrogen atom(s) on one or both of the nitrogen atoms of which may each be substituted by a lower alkyl group; or a salt thereof; as well as a pharmaceutical, antitumor effect potentiator and antitumor agent containing same as an active ingredient.