苯并[ a ]喹啉鎓(1),噻吩并[3,2- a ]-和噻吩并[2,3- a ]喹啉鎓4和5和噻唑并[2,3- a ]异喹啉鎓(6)的三种硫醇稠合类似物分别通过1-(2-噻吩基乙烯基)吡啶鎓盐9a和9b以及3-苯乙烯基噻唑鎓盐9c的光环化合成α ,β ,β-和β- 。的硝化化合物4,5,和6分别在2位,3主要发生,和7,而将硝基引入到8位和10位1以68:32的比例。还比较了母体化合物1的nmr和uv光谱特性以及4–6的还原电位。
Base-mediated 1,3-dipolar cycloaddition of pyridinium bromides with bromoallyl sulfones: a facile access to indolizine scaffolds
作者:Chetna Jadala、Velma Ganga Reddy、Namballa Hari Krishna、Nagula Shankaraiah、Ahmed Kamal
DOI:10.1039/d0ob01696a
日期:——
synthetic strategy has been developed for the construction of substituted indolizines from a unique combination of pyridiniumsalts and 2-bromoallyl sulfones. This approach does not compromise with the diverse substitutions on both the pyridiniumsalts and 2-bromoallyl sulfones. Wide substrate scope, operational simplicity, milder reaction conditions and good to moderate yields are the merits associated with
Facile one-pot tandem synthesis of perfluoroalkylated indolizines under metal-free mild conditions
作者:Dong He、Yuhong Xu、Jing Han、Hongmei Deng、Min Shao、Jie Chen、Hui Zhang、Weiguo Cao
DOI:10.1016/j.tet.2017.01.005
日期:2017.2
A direct metal-free method for the synthesis of perfluoroalkylated indolizines by means of DIPEA-promoted tandem CN/CC bond formation was developed. Various substituted pyridines and bromoacetyl derivatives with methyl perfluoroalk-2-ynoates proceeded smoothly in this mild transformation, and the desired products were obtained in good to excellent yields under air.
开发了一种直接无金属的方法,该方法通过DIPEA促进的串联C N / C C键的形成来合成全氟烷基化的吲哚嗪。在这种温和的转化过程中,各种被全氟烷基-2-丙酮酸甲酯取代的吡啶和溴代乙酰基衍生物可顺利进行,并在空气中以良好或优异的收率获得所需的产物。