Synthesis of Substituted Thioamides from <i>gem</i>
-Dibromoalkenes and Sodiumsulfide
作者:Ashok K. Morri、Yadagiri Thummala、Ramesh Adepu、Gangavaram V. M. Sharma、Subhash Ghosh、Venkata Ramana Doddi
DOI:10.1002/ejoc.201901411
日期:2019.11.14
Synthesis of thioamides from geminal dibromoalkenes, sodium sulfide and formamide have been reported under catalyst or additive free conditions. Control experiment and mechanistic studies revealed that necessary role of sodium sulfide in this overall transformation.
Copper-Catalyzed Synthesis of 4-Aryl-1H-1,2,3-triazoles from 1,1-Dibromoalkenes and Sodium Azide
作者:Xiaokun Wang、Chunxiang Kuang、Qing Yang
DOI:10.1002/ejoc.201101204
日期:2012.1
A new methodology for the Cu-catalyzed synthesis of 1H-1,2,3-triazoles from1,1-dibromoalkenes and sodiumazide is presented. Aryl dibromoolefins were efficiently converted into the corresponding 1,2,3-triazoles. A comprehensive number of functional groups were compatible with this reaction. 1,2,3-Triazoles were obtained in moderate to excellent yields.
NaOH-promoted reaction of 1,1-dihaloalkenes and 1<i>H</i>-azoles: synthesis of dihetaryl substituted alkenes
作者:Chen Zhang、Yu-Long Shi、Li-Yu Zhang、Dong-Peng Yuan、Meng-Tao Ban、Jia-Yao Zheng、Deng-Hui Liu、Shun-Na Guo、Dong-Mei Cui
DOI:10.1039/c8nj02756k
日期:——
An efficient NaOH-promoted synthesis of dihetaryl substituted alkenes from 1,1-dihaloalkenes and 1H-azoles under mild conditions has been developed. The reaction occurred in moderate to good yields and tolerated aliphatic, heterocyclic, and aryl substituted 1,1-dihaloalkenes containing functionalities such as nitriles, ethers, and halogens. Imidazoles and triazoles also afforded the desired products
Highly selective cross-coupling reactions of 1,1-dibromoethylenes with alkynylaluminums for the synthesis of aryl substituted conjugated enediynes and unsymmetrical 1,3-diynes
作者:Kun Wu、Chuan Wu、Xiao-Ying Jia、Lin Zhou、Qing-Han Li
DOI:10.1039/d2ra02127g
日期:——
A highly efficient method for the synthesis of aryl substituted conjugated enediynes and unsymmetrical 1,3-diynes via selective cross-couplingreactions of 1,1-dibromoethylenes with alkynylaluminums using the Pd(OAc)2–DPPE and Pd2(dba)3–TFP complexes as catalysts, respectively, has been successfully developed. Though the alkyl substituted conjugated enediynes and unsymmetrical 1,3-diynes were not obtained
Synthesis of the 2-alkynyl benzo[b]furanes/benzo[b]thiophenes from the cross-coupling reaction of benzo[b]furanyl/ benzo[b]thiophene aluminum reagents with gem-dibromoolefin derivatives catalyzed by palladium
作者:Jia-Xia Pu、Jin-Song Hou、Li-Rong Han、Xiao-Ying Jia、Qing-Han Li
DOI:10.1016/j.tet.2024.134089
日期:2024.8
catalyzed synthesis of 2-alkynylbenzo[b]furanes/benzo[b]thiophenes by the cross-coupling of benzo[b]furan/benzo[b]thiophene aluminums with gem-dibromoviny derivatives at 80 °C in DMF solvent was developed. The aryls bearing electron-donating or -withdrawing groups in gem-dibromoviny derivatives give the corresponding coupling products 2-alkynylbenzo[b]furanes/benzo[b]thiophenes in moderate to good isolated
PdCl(dppf)/MePhos 催化合成 2-炔基苯并[b]呋喃/苯并[b]噻吩,通过苯并[b]呋喃/苯并[b]噻吩铝与偕二溴衍生物在 80 °C 交叉偶联在DMF溶剂中开发。偕二溴乙烯基衍生物中带有给电子或吸电子基团的芳基可产生相应的偶联产物 2-炔基苯并[b]呋喃/苯并[b]噻吩,分离产率中等至良好,高达 74%。对于电中性、富电子或缺电子的苯并[b]呋喃基/苯并[b]噻吩铝试剂,也可以得到相应的2-炔基苯并[b]呋喃/苯并[b]噻吩化合物,并具有中等至良好的分离产率。该过程简单易行,为2-炔基苯并[b]呋喃/苯并[b]噻吩衍生物的合成提供了一种有效的方法。根据实验结果,提出了一种可能的催化循环。