This disclosure describes compounds of the formula ##STR1## where R.sub.1 represents hydrogen, fluoro, chloro, lower alkyl having 1 to 4 carbon atoms or lower alkoxy having 1 to 4 carbon atoms, and R.sub.2 and R.sub.3 each independently represent lower alkyl as defined above, or R.sub.2 and R.sub.3 together with N represent ##STR2## wherein n is 1, 2 or 3, and R.sub.4 and R.sub.5 each independently represent hydrogen or lower alkyl as defined above, or a pharmaceutically acceptable acid addition salt thereof, which are useful as anti-diabetic agents in particular as hypoglycemic agents and inhibiting or impeding post-prandial hyperglycemia.
本公开说明了以下式子的化合物:##STR1## 其中,R.sub.1代表氢、
氟、
氯、具有1至4个碳原子的低级烷基或具有1至4个碳原子的低级烷氧基,而R.sub.2和R.sub.3各自独立地代表如上所定义的低级烷基,或者R.sub.2和R.sub.3与N一起代表##STR2## 其中n为1、2或3,而R.sub.4和R.sub.5各自独立地代表氢或者如上所定义的低级烷基,或其药学上可接受的酸加成盐。这些化合物可用作抗糖尿病药物,特别是作为降血糖药物,并能够抑制或阻碍餐后高血糖。