Abstract

Herein, we report a convenient methodology for the synthesis of fluorinated 1,4,5-substituted 1,2,3-triazoles. The azide–alkyne cycloaddition reaction 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-[(trifluoromethyl)thio]acetylenes, were used. This ruthenium-catalyzed azide–alkyne cycloaddition reaction was highly regioselective giving 4-aryl-5-(2,2,2-trifluoroethyl)- or 4-aryl-5-[(trifluoromethyl)thio]-1H-1,2,3-triazoles. Various functionalities were tolerated in the alkyl and aryl azides by this Huisgen 1,3-dipolar cycloaddition. All the triazoles were characterized by ¹H, ¹³C, and ¹⁹F NMR, IR, and HRMS (or elemental analysis). Several triazoles were characterized by single-crystal X-ray structural analysis to confirm the regioselectivity of 1,2,3-triazole formation.

Herein, we report a convenient methodology for the synthesis of fluorinated 1,4,5-substituted 1,2,3-triazoles. The azide–alkyne cycloaddition reaction 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-[(trifluoromethyl)thio]acetylenes, were used. This ruthenium-catalyzed azide–alkyne cycloaddition reaction was highly regioselective giving 4-aryl-5-(2,2,2-trifluoroethyl)- or 4-aryl-5-[(trifluoromethyl)thio]-1H-1,2,3-triazoles. Various functionalities were tolerated in the alkyl and aryl azides by this Huisgen 1,3-dipolar cycloaddition. All the triazoles were characterized by ¹H, ¹³C, and ¹⁹F NMR, IR, and HRMS (or elemental analysis). Several triazoles were characterized by single-crystal X-ray structural analysis to confirm the regioselectivity of 1,2,3-triazole formation.

中文翻译：

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RuAAC反应合成含氟1,4,5-取代的1,2,3-三唑

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1,2,3-三唑。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。