非消旋仲醇的对映选择性合成已通过铜催化的(Cu(OAc)2 ·H 2 O /(R)-3,4,5-MeO-MeO-MePH-BIPHEP)还原芳基/杂芳基在胶束水溶液中实现酮。这种方法学是一种绿色的方案,可使用贱金属催化剂以及廉价,无害且方便的化学计量氢化物源(PMHS)在温和的条件下(0-22°C)获取对映体富集的醇。形成的仲醇产品的收率好至极好,ee值大于90%。
the visible light induced simple copper(II) chloride catalyzedoxidation of diarylacetylenes to α-diketones by molecular oxygen at roomtemperature. The in situ generated copper(II)-superoxo complex is a light-absorbing species that oxidizes inert diarylacetylenes to α-diketones. In contrast to reported photochemical processes, the current oxidation protocol does not require any exogenous photocatalyst
Cu(I) catalysts [Cu(L1−4)Cl(PPh3)] where L1−4 = condensed product of 2-(1-phenylhydrazinyl)-pyridine with different benzaldehydes} were synthesized, characterized by 1H, 31P NMR, UV–Vis and IR techniques. Complex 2 structure was authenticated by single crystal X-ray method. Different electron donating and withdrawing substituents are present in the ligand frame of Cu(I) catalysts and their role on
合成了Cu(I)催化剂[Cu(L 1-4)Cl(PPh 3)],其中L 1-4 = 2-(1-苯基肼基)-吡啶与不同的苯甲醛的缩合物},其特征在于1 H,31 P NMR,UV-Vis和IR技术。复合物2的结构通过单晶X射线法进行了鉴定。Cu(I)催化剂的配体框架中存在不同的给电子和吸电子取代基,并研究了它们在Sonogashira反应中的作用。发现偶联反应催化剂的效率顺序为2 > 1 > 3 > 4清楚地表明存在于配体框架中的取代基的作用对于有效催化Sonogashira反应是有用的。使用1 H和13 C NMR表征产物。
作者:Jong-Ho Kim、Dong-Ho Lee、Bong-Hyun Jun、Yoon-Sik Lee
DOI:10.1016/j.tetlet.2007.08.015
日期:2007.10
A core-shell type of polymer-supported N-heterocyclic carbene (NHC) palladium catalyst was applied to Sonogashira cross-coupling reactions without copper cocatalyst under ambient atmosphere. This supported NHC–palladium complex efficiently catalyzed the copper-free Sonogashira reaction of various aryliodides and bromides with terminal alkynes; the reaction exhibited high dependency on the temperature
Efficient One-Pot Synthesis of the Unsymmetrical Diarylalkynes from Two Different Aryl Bromides and Propiolic Acid by Using Pd(PPh<sub>3</sub>)<sub>4</sub>Catalyst
作者:Kyungho Park、Wonyoung Kim、Sunwoo Lee
DOI:10.5012/bkcs.2013.34.10.2859
日期:2013.10.20
propiolic acid with aryl bromides, which is cost effective, unlike aryliodides, despite the low reactivity by using sulfonated XPhos as a ligand. Goossen reported the method for the synthesis of unsymmetrical diarylalkynes with the combination of two different aryl bromides in the presence of SPhos. Recently, we reported that the Pd(PPh3)4 catalyzed a selective Sonogashira reaction with aryl bromides at low