本文通过铜催化的2-溴-N -prop-2的一锅顺序羟化-O-烷基化/点击反应合成了新型的含芳氧基衍生物(8a-1)的酰胺键合的1,2,3-三唑。-炔基苯甲酰胺。产物以有效的方式合成,具有高分离产率。合成方法涉及在一锅铜催化的羟基化-O-烷基化/点击反应上使用2-溴-N-丙-2-炔基-苯甲酰胺和各种苄基卤化物。产物通过1 H NMR,13 C NMR,质谱,FT-IR,元素分析,熔点和单晶X射线衍射进行表征。H 2中原位制备的酚部分O / DMF作为溶剂\共溶剂系统提示进行苄基卤与酚之间的反应。该方法的分步经济特征导致以高分离收率合成产物。
A palladium-catalyzed process to construct oxazoles and oxazolines with broad functional-group tolerance has been developed, and the method introduces difluoromethyl groups into heterocycles in a one-pot fashion. This system uses a carbonyl oxygen as the acceptor for the addition of a vinylpalladium intermediate to achieve the cyclization. Oxazoline derivatives are generated as the Z-isomer with high
A cesium carbonate promoted, transition metal and halogen‐free 5‐exo‐dig type cyclization reaction for the synthesis of oxazoles and imidazoles has been developed.
A visible-light-mediated hydrotrifluoromethylation of unactivatedalkenes that uses the Umemoto reagent as the CF(3) source and MeOH as the reductant is disclosed. This effective transformation operates at room temperature in the presence of 5 mol % Ru(bpy)(3)Cl(2); the process is characterized by its operational simplicity and functional group tolerance.
Alkynesdifunctionalization is a powerful strategy in organic synthesis that provides a convenient synthetic entry for internal alkenes. The main challenge in this field was considered to be the geometry control of the newly formed double bond (thermodynamically controlled or kinetically controlled). Herein, we report a novel procedure (through the cyclic compounds broken) to completely control the
Tungsten and molybdenum catalyst-mediated cyclisation of N-propargyl amides
作者:Xiangjian Meng、Sunggak Kim
DOI:10.1039/c1ob05512g
日期:——
Tungsten and molybdenum catalysts were employed to promote the cyclisation of N-propargylic amides to afford the corresponding oxazolines or oxazines via 5-exo-dig or 6-endo-dig mode.