| 摘要 |
PCT No. PCT/EP90/01710 Sec. 371 Date Jun. 9, 1992 Sec. 102(e) Date Jun. 9, 1992 PCT Filed Oct. 11, 1990 PCT Pub. No. WO91/05791 PCT Pub. Date May 2, 1991.Diphosphonic acids of formula (I), wherein R1 and R2 are hydrogen or C1-C4 alkyl; (A) is hydrogen, halogen, hydroxy or C1-C12 alkyl; (B) is a bond, a C1-C8 alkylene chain, a cycloalkylalkylene chain, an alkylene chain substituted by cyclohexyl or cyclopentyl groups, or an aralkyl chain, an alkyl chain containing an heteroatom (O, S or N-CH3) or an ureido residue -(CH2)nl-NHCONH-(CH2)n-with n ranging from 1 to 5, R3 is hydrogen, C1-C9 alkyl, C3-C6 cycloalkyl, benzyl, phenyl or p-methoxybenzyl; (C) is C1-C5 alkyl, phenyl or an aralkyl chain; R4 is hudrogen, C1-C5 alkyl or an amino group optionally substituted by alkyl, phenyl, benzyl, p-methoxybenzyl, acyl, amminoacidic or peptide groups; R5 and R6 are 2-haloethyl or together form a 1-aziridinyl residue, are useful as antitumor agent.
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