N,N-DISUBSTITUTED AMIC ACID DERIVATIVE

摘要

The present invention relates to a compound of the formula (I): <CHEM> wherein Ar<1>, Ar<2>, Ar<3> and Ar<4> represent an aryl group or a heteroaromatic ring group; A represents a hydrocarbon group which may be substituted; X and Y represent an oxygen atom, a sulfur atom, a carbonyl group or a group of the formula -CHR<a>- (wherein R<a> is a hydrogen atom or a lower alkyl group) or -NR<b>- (wherein R<b> is a hydrogen atom or a lower alkyl group), or X and Y together represent a vinylene group or an ethynylene group; R<1>, R<2>, R<3>, R<8> and R<9> represent a hydrogen atom, a halogen atom, a hydroxyl group, a lower alkyl group or a lower alkoxy group; R<4> and R<5> represent a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a nitro group, a cyano group, a carboxyl group, a lower alkoxycarbonyl group, a carbamoyl group, a lower alkylcarbamoyl group, a lower alkyl group, a lower hydroxyalkyl group, a lower fluoroalkyl group or a lower alkoxy group; R<6> is a lower alkyl group; and R<7> is a hydrogen atom or a lower alkyl group, provided that when one of X and Y is an oxygen atom, a sulfur atom or a group of the formula -NR<b>-, the other is a carbonyl group or a group of the formula -CHR<a>-, its pharmaceutically acceptable salt or ester, and an antitumor agent containing it as an active ingredient.