Substituted Quinazoline or Pyridopyrimidine Derivative

摘要

The present invention provides a compound having a glucokinase activating action being useful for prevention or treatment of diabetes mellitus, etc. being represented by the formula (I): X is nitrogen atom, etc.; Y is oxygen atom, etc.; R¹ is an optionally substituted five to six-membered heteroaryl group, etc.; R² is hydrogen atom or fluorine atom; and ring A is a monocyclic or bicyclic heteroaryl group which may have a substituent represented by the formula (II)] or a pharmaceutically acceptable salt thereof.