| 摘要 |
The present invention is directed to compounds useful in the treatment of autoimmune diseases and inflammatory diseases of general formula (I) wherein R1 is alkyl, alkenyl or alkynyl having from 1 to 6 carbons, phenyl, benzyl or phenethyl; R2 is H, C1 to C5 alkyl which can optionally be partially hydroxylated or the group (a) wherein n is from 0 to 4; and X, Y and Z are independently CH, N, NH, O or S, or a pharmaceutically acceptable ester or acid addition salt thereof, or a stereoisomer or a geometric isomer thereof, with the proviso that at least one of X, Y or Z is CH, that one and only one of X, Y and Z is NH, O or S and further that when Y is N or NH then Z is not N or NH. The present invention is also concerned with processes for the synthesis of the compounds and with methods of use of the compounds. |
