PYRIDAZINONE COMPOUNDS AS PHOSPHODIESTERASE INHIBITORS AND METHODS OF TREATING DISORDERS
申请人:Takeda Pharmaceutical Company Limited
公开号:US20170114044A1
公开(公告)日:2017-04-27
The present invention provides a compound which has the effect of PDE inhibition, and which is useful as a medicament for preventing or treating schizophrenia or so on.
A compound of formula (I
0
)
wherein
R
1
represents
a substituent,
R
2
represents
a hydrogen atom, or a substituent,
R
3
represents
a hydrogen atom, or a substituent,
Ring A represents
an aromatic ring which can be substituted, and
Ring B represents
a 5-membered heteroaromatic ring which can be substituted,
or a salt thereof.