Pd-PEPPSI-IPent<sup>An</sup> Promoted Deactivated Amination of Aryl Chlorides with Amines under Aerobic Conditions
作者:Fei-Dong Huang、Chang Xu、Dong-Dong Lu、Dong-Sheng Shen、Tian Li、Feng-Shou Liu
DOI:10.1021/acs.joc.8b01205
日期:2018.8.17
We report herein a highly efficient Pd-catalyzed amination by “bulky-yet-flexible” Pd-PEPPSI-IPentAn complexes. The relationship between the N-heterocyclic carbenes (NHCs) structure and catalytic properties was discussed. Sterically hindered (hetero)arylchlorides and a variety of aliphatic and aromatic amines can be applied in this cross-coupling, which smoothly proceeded to provide desired products
我们在此报告了一种由“大体积但还灵活”的Pd-PEPPSI-IPent An复合物进行的高效Pd催化胺化反应。讨论了N-杂环卡宾(NHCs)结构与催化性能之间的关系。可以在该交叉偶联中应用立体受阻的(杂)芳基氯化物以及各种脂肪族和芳香族胺,它们可以顺利进行以提供所需的产物。操作简单的协议强调了在不排除空气和水分的情况下,在温和条件下可快速获得C Ar -N键的形成。
C–H Functionalization of Benzothiazoles via Thiazol-2-yl-phosphonium Intermediates
to form thiazol-2-yl-triphenylphosphonium salts, and these phosphoniumsalts react with a wide range of O- and N-centered nucleophiles to give the corresponding ethers, amines, and C-N biaryls. The reactions proceed under mild conditions and allow for the recovery of triphenylphosphine at the end of the sequence. In the presence of hydroxide, phosphoniumsalts undergo disproportionation, resulting in
苯并噻唑与三苯基膦进行区域选择性 C2-H 官能化形成噻唑-2-基-三苯基鏻盐,这些鏻盐与多种 O 和 N 中心亲核试剂反应生成相应的醚、胺和 CN 联芳基。反应在温和条件下进行,并允许在序列末端回收三苯膦。在氢氧化物存在下,鏻盐发生歧化反应,导致苯并噻唑还原,这可用于苯并噻唑的特定 C2 氘化。
Unexpected Dealkylation During Nucleophilic Substitution: Synthesis of 2-N,N-Dialkylamino Benzoxazoles and Benzothiazoles
作者:Abedawn I Khalaf、Ricardo G Alvarez、Colin J Suckling、Roger D Waigh
DOI:10.1016/s0040-4020(00)00802-4
日期:2000.10
and benzothiazoles from 2-chlorobenzoxazole and 2-chlorobenzothiazole and N-methyl or other simple N-alkyl tertiary amines. The reaction proceeds neat or in THF solution and involves dealkylation of the amine reactant by nucleophilic substitution by chloride. In the case of N-methylpyrrolidine and N-methylpiperidine demethylation was not observed and the major product was formed by ringopening to give
描述了由2-氯苯并恶唑和2-氯苯并噻唑和N-甲基或其他简单的N-烷基叔胺制备许多2-烷基-和2-芳基氨基苯并恶唑和苯并噻唑的温和反应条件。反应在纯溶液中或在THF溶液中进行,并且涉及通过氯化物的亲核取代使胺反应物脱烷基。在N-甲基吡咯烷和N-甲基哌啶未观察到脱甲基的情况下,通过开环形成主要产物,得到氯丁基-和氯戊基-甲基氨基取代的苯并恶唑和苯并噻唑。在丙酮中用碘化物处理氯丁基衍生物,得到新的1 H,2 H,3H,4 H,5 H- [1,3]二氮杂[2,1- b ] [1,3]苯并恶唑-6-鎓环系统。
Scope and Mechanism of Palladium-Catalyzed Amination of Five-Membered Heterocyclic Halides
作者:Mark W. Hooper、Masaru Utsunomiya、John F. Hartwig
DOI:10.1021/jo0266339
日期:2003.4.1
Detailed studies have been conducted to determine the activity of palladium catalysts for the amination of five-membered heterocyclic halides and to determine the factors that control the scope of this reaction. Palladium-catalyzed aminations of the electron-rich furanyl, thiophenyl, and indolyl halides and of the related 2-halogenated thiazoles, benzimidazole, and benzoxazole have been shown to occur
Copper-catalyzed synthesis of 2-aminobenzothiazoles from 2-iodophenyl isocyanides, potassium sulfide and amines
作者:Hao Min、Genhua Xiao、Wenjuan Liu、Yun Liang
DOI:10.1039/c6ob02413k
日期:——
A simple and practically useful synthetic method for the synthesis of a variety of 2-aminobenzothiazoles was developed. This methodology could construct one C–N bond and two C–S bonds in a step reaction and provide the desired products in good to perfect yields.