已经开发出一种简单且容易的一锅反应,以提供包含两个不同取代的N原子的N,N'-二取代的苯并咪唑酮和咪唑并吡啶并酮的不同范围。协同的Pd(II)/ Ag(I)系统促进了(杂)芳族胺和异氰酸酯的顺序加成/分子内CH-H酰胺化反应,导致形成两个C-N键。一种机制,涉及在Ag 2 CO 3氧化剂和Pd(OAc)2存在下通过单电子转移(SET)生成的自由基中间体提出了路易斯酸。该协议使用易于获得的起始原料,良好的官能团耐受性和高效率,提供了一种操作简便,简单且可靠的方法。
hydroaminoalkylation of terminal alkenes, 1,3‐dienes, or styrenes allows a direct and highly atom efficient (100 %) synthesis of amines which can result in the formation of two regioisomers, the linear and the branched product. We present a new titanium catalyst with 2,6‐bis(phenylamino)pyridinato ligands for intermolecular hydroaminoalkylation reactions of styrenes and 1‐phenyl‐1,3‐butadienes that delivers the
isotope exchange (HIE) with transition metal catalysts is one of the most well-developed methods for the labeling of various aromatic compounds, but met with limited success with aromatic ethers and fluorides. Herein, we present a practical method for the directed HIE of aromatic ethers and fluorides with D2/T2 gas catalyzed by heavy alkali metal amides. Using commercially available potassium amide KN(SiMe3)2
氘和氚标记的化合物在药物开发过程中发挥着重要作用。使用过渡金属催化剂的邻位定向氢同位素交换(HIE)是标记各种芳香族化合物最成熟的方法之一,但在芳香族醚和氟化物方面取得的成功有限。在此,我们提出了一种在重碱金属酰胺催化下用 D 2 /T 2 气体直接 HIE 催化芳族醚和氟化物的实用方法。使用市售的氨基钾KN(SiMe 3 ) 2 作为HIE催化剂,我们成功实现了具有高比活性的复杂药物化合物的氚化。这种简单实用的方法为过渡金属催化 HIE 提供了宝贵的补充,能够扩大底物范围并拓宽 HIE 工具箱以实现有效的同位素标记。控制实验和密度泛函理论(DFT)计算揭示了芳香族C-H键和碱金属酰胺之间有趣的动力学去质子平衡,并很好地解释了碱金属酰胺催化剂MN(SiMe 3 ) (M = Cs、K 和 Na)。
Palladium-Catalyzed Oxidation of <i>Boc</i>-Protected <i>N</i>-Methylamines with IOAc as the Oxidant: A <i>Boc-</i>Directed sp<sup>3</sup> C−H Bond Activation
作者:Dong-Hui Wang、Xue-Shi Hao、Di-Fu Wu、Jin-Quan Yu
DOI:10.1021/ol061384m
日期:2006.7.1
Pd-catalyzed selective oxidation of Boc-protected N-methylamines with IOAc as the oxidant is described. Evidence for the involvement of a Boc-directed C-H activation process is provided.
Palladium-Catalyzed Oxidative Carbonylation of Aromatic C–H Bonds of <i>N</i>-Alkylanilines with CO and Alcohols for the Synthesis of <i>o</i>-Aminobenzoates
A Pd(II)-catalyzed CH monocarbonylation of N-alkylanilines for the synthesis of o-aminobenzoates has been developed. Various aliphatic alcohols and phenol were tolerated in the reaction to afford the corresponding o-aminobenzoates in good yields under mild balloon pressure of CO.