Cyclic lipid derivatives as potent PAF antagonists

摘要

The present invention describes novel cyclic diol derivatives represented by formula I and II: <IMAGE> I <IMAGE> II in which Y represents O, S, SO, SO2, (CH2)m wherein m is zero or an integer of 1 to 5, or NR2 group wherein Ra is hydrogen, lower alkyl, lower alkoxycarbonyl, aryl, arylalkyl or acyl; R1 represents an alkyl or alkylcarbamoyl group; R2 represents a group having formula T-(CH2)n-V (X-)q, wherein T refers to a simple covalent bond, a CO, PO3-, C(O)O, or CONRb group wherein Rb is hydrogen, lower alkyl or acyl; n refers to an integer of from 1 to 10; V represents either (i) the group indicated by formula -+NR5R6R7 wherein R5, R6 and R7 stands for identical or different lower alkyl group, or two or three of R5, R6 and R7 taken together with the adjacent nitrogen form heterocyclic ammonio group, or (ii) the group indicated by the formula <IMAGE> wherein R8 represents lower alkyl group; q is one or zero; X- represents a pharmaceutically acceptable anion. These compounds are potent PAF antagonists and thus useful for the treatment of the diseases in which PAF is involved.