Compounds of formula (I) ##STR1## and their pharmaceutically acceptable acid addition salts, wherein R represents lower alkyl or a mono- or bicyclic aryl or heteroaryl radical, R.sup.1 and R.sup.2 which may be the same or different each represent hydrogen, hydroxyl, lower alkyl, lower alkoxy, halo(lower)alkyl, halogen, amino or mono- or di(lower)alkylamino, X represents--CH.sub.2 CR.sup.3 R.sup.4 CH.sub.2 --or --(CH.sub.2).sub.4 --where R.sup.3 and R.sup.4 each independently represent hydrogen or lower alkyl or R.sup.3 and R.sup.4 together with the carbon atom to which they are attached represent a 5, 6 or 7 membered carbocyclic ring and R.sup.5 represents acyl and R.sup.6 represents hydrogen or R.sup.5 and R.sup.6 each independently represent hydrogen or lower alkyl, are useful as hypoglycaemics.
式(I)化合物及其药学上可接受的酸盐,其中R代表较低的烷基或单环或双环芳基或杂芳基基团,R1和R2可以相同或不同,分别代表氢、羟基、较低的烷基、较低的烷氧基、卤代(较低)烷基、卤素、
氨基或单或二(较低)烷基
氨基,X代表- CR3R4 -或-(
CH2)4-,其中R3和R4各自独立地代表氢或较低的烷基,或R3和R4与它们所连接的碳原子一起代表5、6或7个成员的碳环,R5代表酰基,R6代表氢或R5和R6各自独立地代表氢或较低的烷基,可用作降糖药物。