The present invention provides a fused pyrimidine derivative having an insulin secretion stimulating activity represented by Formula (I):
wherein R1 represents a hydrogen atom, lower alkyl, or the like; n represents an integer of 0 to 3; and X1 and X2 may be the same or different and each represents a hydrogen atom, lower alkyl, or the like; and formula (II):
represents formula (III):
[wherein X--Y--Z represents R2C=CR3-NR4 (wherein R2, R3 and R4 may be the same or different and each represents a hydrogen atom, lower alkyl, or the like)]}, or a pharmaceutically acceptable salt thereof.
A fused pyrimidine derivative is presented. The derivatie has an insulin secretion stimulating activity represented by Formula (I):
wherein R
1
represents a hydrogen atom, lower alkyl, or the like; n represents an integer of 0 to 3; and X
1
and X
2
may be the same or different and each represents a hydrogen atom, lower alkyl, or the like; and formula (II):
represents formula (III):
[wherein X—Y—Z represents R
2
C═CR
3
—NR
4
(wherein R
2
, R
3
and R
4
may be the same or different and each represents a hydrogen atom, lower alkyl, or the like)]}, or a pharmaceutically acceptable salt thereof.