Palladium-Catalyzed Trifluoroethylation of Terminal Alkynes with 1,1,1-Trifluoro-2-iodoethane
摘要:
An efficient C-sp-CH2CF3 bond-forming reaction via Pd-catalyzed 2,2,2-trifluoroethylation of aryl and alkyl terminal alkynes has been developed. This protocol proceeds under mild conditions using the readily available and cheap reagent CF3CH2I as the source of the CH2CF3 group. Various terminal aryl alkynes as well as alkylacetylenes can be transformed Into the corresponding trifluoroethylated products In good-to-excellent yields. The method is tolerant of carbonyl, nitro, ester, cyano, and even formyl groups.
Palladium-Catalyzed Trifluoroethylation of Terminal Alkynes with 1,1,1-Trifluoro-2-iodoethane
摘要:
An efficient C-sp-CH2CF3 bond-forming reaction via Pd-catalyzed 2,2,2-trifluoroethylation of aryl and alkyl terminal alkynes has been developed. This protocol proceeds under mild conditions using the readily available and cheap reagent CF3CH2I as the source of the CH2CF3 group. Various terminal aryl alkynes as well as alkylacetylenes can be transformed Into the corresponding trifluoroethylated products In good-to-excellent yields. The method is tolerant of carbonyl, nitro, ester, cyano, and even formyl groups.
Palladium-Catalyzed Decarboxylative Trifluoroethylation of Aryl Alkynyl Carboxylic Acids
作者:Jinil Hwang、Kyungho Park、Juseok Choe、Hongkeun Min、Kwang Ho Song、Sunwoo Lee
DOI:10.1021/jo5003032
日期:2014.4.4
A trifluoroethylation of alkynes through a palladium-catalyzeddecarboxylativecoupling reaction was developed. When alkynyl carboxylic acids and ICH2CF3 were allowed to react with [Pd(η3-allyl)Cl]2/XantPhos and Cs2CO3 in N,N-dimethylformamide (DMF) at 80 °C for 1 h, the desired products were formed in good yields. This catalytic system showed high functional group tolerance.
Synthesis of Fluorinated 1,4,5-Substituted 1,2,3-Triazoles by RuAAC Reaction
作者:Yan-gen Huang、Qing-Yun Chen、Yong Guo、Qian Shen、En-jian Han
DOI:10.1055/s-0035-1560352
日期:——
formation. Herein, we report a convenient methodology for the synthesis of fluorinated 1,4,5-substituted 1,2,3-triazoles. The azide–alkyne cycloadditionreaction of internal alkynes catalyzed by a ruthenium complex efficiently afforded 2,2,2-trifluoroethyl- and (trifluoromethyl)thio-substituted 1,2,3-triazoles. Two types of internal alkyne, 1-aryl-2-(2,2,2-trifluoroethyl)acetylenes and 1-aryl-2-[(tr
摘要 在这里,我们报告了一种方便的方法,用于合成氟化的1,4,5-取代的1,2,3-三唑。钌配合物催化的内部炔烃的叠氮化物-炔烃环加成反应有效地提供了2,2,2-三氟乙基-和(三氟甲基)硫基取代的1,2,3-三唑。使用了两种类型的内部炔烃:1-芳基-2-(2,2,2-三氟乙基)乙炔和1-芳基-2-[(三氟甲基)硫代]乙炔。此钌催化的叠氮化物-炔烃环加成反应具有高度区域选择性,可得到4-芳基-5-(2,2,2-三氟乙基)-或4-芳基-5-[(三氟甲基)硫代] -1 H -1,2, 3-三唑。该Huisgen 1,3-偶极环加成反应在烷基和芳基叠氮化物中具有各种功能。所有三唑的特征在于1 H,13C和19 F NMR,IR和HRMS(或元素分析)。通过单晶X射线结构分析表征了几种三唑,以确认1,2,3-三唑形成的区域选择性。 在这里,我们报告了一种方便的方法,用于合成氟化的1,4,5-取代的1