2-methyl-5-bromo-3-hydroxymethylfuran 在
manganese dioxide manganese dioxide 、 silica gel 、 ethyl acetate n-hexane 作用下,
以
四氢呋喃 为溶剂,
反应 48.0h,
以to give the title compound (2.8 g, 51%) as a white solid的产率得到5-bromo-2-methylfuran-3-carbaldehyde
The present invention provides a heterocyclic compound represented by the following formula (I), which has a glucagon antagonistic action and is useful for the prophylaxis or treatment of diabetes and the like, a compound represented by
wherein ring A is an optionally substituted benzene ring and the like; Y is a nitrogen atom and the like; X is —O— and the like; R
4
is a hydrogen atom and the like; R
5
and R
6
are each independently a hydrogen atom and the like; R
1
is an optionally substituted hydrocarbon group and the like; R
2
is a hydrogen atom and the like; and R
3
is —(CH
2
)
3
—COOH and the like, or a salt thereof.
The present invention provides a heterocyclic compound represented by the following formula (I), which has a glucagon antagonistic action and is useful for the prophylaxis or treatment of diabetes and the like, a compound represented by
wherein ring A is an optionally substituted benzene ring and the like; Y is a nitrogen atom and the like; X is —O— and the like; R4 is a hydrogen atom and the like; R5 and R6 are each independently a hydrogen atom and the like; R1 is an optionally substituted hydrocarbon group and the like; R2 is a hydrogen atom and the like; and R3 is —(CH2)3—COOH and the like, or a salt thereof.