Acylaminosaccharide derivative and process for preparing the same.

摘要

There are disclosed an acylaminosaccharide derivative represented by the formula (I): <CHEM> wherein R<1> is H, aryl or heterocyclic; X is a mere bond, alkylene, alkenylene or alkynylene; R<2> is (1) H, (2) aryl or heterocyclic, (3) aryl lower alkylcarbamoyl, (4) substituted carbonyl, or (5) carboxyl which may be esterified; Y is a mere bond, alkylene, alkenylene, alkynylene or tricycloalkylene; R<3> and R<4> are different and either hydrogen, or lower alkoxy or phenoxy; R<5> and R<6> are different and either hydrogen or hydroxy; and when R<7> is hydroxy, R<8> and R<9> are different and either hydrogen or hydroxy, or when R<7> and R<8> are bonded to each other to form lower alkylenedioxy, R<9> is hydrogen, or a pharmaceutically acceptable salt thereof, and a process for preparing the same.