通过铜催化的5-(2-溴芳基)-1 H-吡唑与羰基化合物和氨水的串联反应合成吡唑并[1,5- c ]喹唑啉衍生物
摘要:
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。
CuCl-catalyzed one-pot synthesis of 5,6-dihydropyrazolo[1,5-c]quinazolines
作者:Shenghai Guo、Jiliang Wang、Yan Li、Xuesen Fan
DOI:10.1016/j.tet.2014.02.027
日期:2014.4
A simple and efficient procedure for the preparation of 5,6-dihydropyrazolo[1,5-c]quinazolines via CuCl-catalyzed tandem reaction of 5-(2-bromoaryl)-1H-pyrazoles with aldehydes and aqueous ammonia under nitrogen atmosphere has been developed. The usefulness of this novel methodology was showcased by its successful application in the preparation of a potential Eg5 inhibitor.
在氮气气氛下,通过CuCl催化5-(2-溴芳基)-1 H-吡唑与醛和氨水的串联反应,制备5,6-二氢吡唑并[1,5- c ]喹唑啉的简单有效的方法具有已开发。这种新方法的实用性在成功地制备潜在的Eg5抑制剂中得到了证明。
Cu-Catalyzed alkynylation–cyclization cascade for the construction of the pyrazolo[5,1-a]isoquinoline skeleton
A Cu-catalyzed Sonogashira-type coupling of 3-(2-bromophenyl)pyrazoles with terminal alkynes combined with a subsequent electrophilic cyclization in the same pot was developed to afford pyrazolo[5,1-a]isoquinolines. The transformation proceeds without the necessity of using Pd or ligands, while an Ag additive is beneficial.