The addition of nitrogen heterocycles such as pyridine,quinolone and isoquinoline to the electron-deficient alkynes generated a special zwitterionic intermediate,which is known as Huisgen’s 1,4-dipole,has become one ...
详细信息
The addition of nitrogen heterocycles such as pyridine,quinolone and isoquinoline to the electron-deficient alkynes generated a special zwitterionic intermediate,which is known as Huisgen’s 1,4-dipole,has become one of the most valuable synthetic blocks in organic *** recent years,numerous domino or multicomponent synthetic reactions based on Huisgen’s 1,4-dipoles as the key reaction substrates have been successfully *** with the widely applied 1,3-dipolar cycloaddition reactions in construction of various five-membered ring systems,the cycloaddition reaction of Huisgen’s 1,4-dipoles with versatile 1,3-dipolarophiles for synthesis of nitrogen-containing six-membered rings have not attracted much attentions until *** order to further demonstrate the potential synthetic applications of Huisgen’s 1,4-dipoles for heterocyclic compounds,We successfully found that the three-component reaction of isoquinoline,dimethyl acetylenedicarboxylate and arylidene pivaloylacetonitrile in acetonitrile at room temperature afforded pyrido[2,1-a]isoquinolines in good yields and with high *** arylidene1,3-indanediones,Meldrum acids,and N,N-dimethylbarbituric acids were employed in the reaction,the novel functionalized spiropyrido[2,1-a]isoquinolines were also efficiently obtained in satisfactory yields.
暂无评论