| 摘要 |
The compounds of the formula I <CHEM> wherein R represents hydrogen or lower alkyl; R<1> represents cycloalkyl, cycloalkyl-lower alkyl, 2-norbornanyl, 2-norbornanyl-lower alkyl, aryl, aryl-lower alkyl, aryl-cycloalkyl, 9-fluorenyl, diaryl-lower alkyl or 9-fluorenyl-lower alkyl; or R<1> represents a bicyclic benzo-fused 5- or 6-membered saturated carbocyclic radical or a benzo-fused 5- or 6-membered saturated heterocyclic radical containing a heteroatom selected from oxygen and sulfur which is directly attached to the fused benzene ring, any said bicyclic radical being unsubstituted or substituted on the benzo portion by lower alkyl, lower alkoxy, hydroxy, halogen or trifluoromethyl, or by a substituent -W-Z in which W represents a direct bond, lower alkylene, lower alkenylene, thio-lower alkylene or oxy-lowe alkylene and Z represents cyano, carboxy or carboxy derivatized in the form of a pharmaceutically acceptable ester or amide; R<2> represents hydrogen, lower alkyl or aryl-lower alkyl; R<3> represents hydrogen or hydroxy; R<4> represents hydrogen, lower alkyl, aryl-lower alkyl, cycloalkyl or hydroxy-lower alkyl; pharmaceutically acceptable ester derivatives thereof in which free hydroxy groups are esterified in form of a pharmaceutically acceptable ester; pharmaceutically acceptable salts thereof; their preparation, and their use as adenosine-2 receptor agonists are disclosed. |
