Synthesis of Pyrazolo[1,5-<i>c</i>]quinazoline Derivatives through Copper-Catalyzed Tandem Reaction of 5-(2-Bromoaryl)-1<i>H</i>-pyrazoles with Carbonyl Compounds and Aqueous Ammonia
A practical and efficient synthesis of pyrazolo[1,5-c]quinazolines and 5,6-dihydropyrazolo[1,5-c]quinazolines, including several spiro compounds, through copper-catalyzed tandem reaction of 5-(2-bromoaryl)-1H-pyrazoles with carbonyl compounds and aqueous ammonia under air has been developed. Compared with literature methods toward pyrazolo[1,5-c]quinazoline derivatives, the synthetic method reported
通过铜催化的5-(2-溴芳基)-串联反应,实用高效地合成吡唑并[1,5- c ]喹唑啉和5,6-二氢吡唑并[1,5 - c ]喹唑啉,包括几种螺环化合物。已开发出在空气中具有羰基化合物和氨水的1 H-吡唑。与有关吡唑并[1,5- c ]喹唑啉衍生物的文献方法相比,本文报道的合成方法具有容易获得和廉价的起始原料和试剂,底物范围广,反应条件温和的优点。
PYRAZOLE DERIVATIVE OR PHARMACEUTICALLY ACCEPTABLE SALT THEREOF
申请人:KISSEI PHARMACEUTICAL CO., LTD.
公开号:US20180170879A1
公开(公告)日:2018-06-21
[Problem] The present invention is to provide a novel pyrazole derivative, or a pharmaceutically acceptable salt thereof, a pharmaceutical composition comprising the same, and a pharmaceutical use thereof.
[Solution] The present invention provides a compound represented by the formula (I) or a pharmaceutically acceptable salt thereof, which has TRPM8 inhibitory effects:
wherein ring A is C
6-10
aryl or the like; X is CR
4a
or the like; R
1
and R
2
are a hydrogen atom or the like; R
3
is a hydrogen atom or the like; R
4
is a hydrogen atom or the like; ring B is C
6-10
aryl or the like; R
5
is a hydrogen atom or the like; R
6a
is a hydrogen atom or the like; R
7a
is a hydrogen atom or the like; R
7b
is a hydrogen atom or the like; R
6b
is a hydrogen atom or the like; R
8
is a hydrogen atom or the like; n is 0, 1 or 2. Therefore, the compound represented by the formula (I) of the present invention or a pharmaceutically acceptable salt thereof is useful as an agent for treating or preventing diseases or symptoms caused by hyperexcitability or disorder of afferent neurons.