| 摘要 |
<p>Five-membered ring compounds represented by general formula (1), useful as drugs such as growth hormone release accelerators, wherein A is an optionally substituted five-membered hydrocarbon ring or an optionally substituted five-membered heterocycle; the atoms marked by '*' are each independently an sp2 carbon atom or a nitrogen atom; X is a single bond or a divalent chain group wherein the chain is constituted of 1 to 5 atoms; R1 is hydrogen, optionally substituted aryl or an optionally substituted unsaturated heterocyclic group; R2 is hydrogen, optionally substituted alkyl, optionally substituted alkenyl or optionally substituted alkynyl; R3 is optionally substituted amino, optionally substituted aminoalkyl, an optionally substituted nitrogenous heterocyclic group or alkyl substituted with an optionally substituted nitrogenous heterocyclic group; R4 is a group represented by the general formula: Ar-R6-, or the like; R5 is hydrogen, lower alkyl or the like; Ar is optionally substituted phenyl or the like; and R6 is optionally substituted C¿1?-C4 alkylene or the like.</p> |
