Pd(II)-Catalyzed C–H Iodination Using Molecular I2 as the Sole Oxidant
摘要:
Pd-catalyzed ortho-C-H iodination directed by a weakly coordinating amide auxiliary using h as the sole oxidant was developed. This reaction is compatible with a wide range of heterocycles including pyridines, imidazoles, oxazoles, thiazoles, isoxazoles, and pyrazoles.
Pd(II)-Catalyzed C–H Iodination Using Molecular I2 as the Sole Oxidant
摘要:
Pd-catalyzed ortho-C-H iodination directed by a weakly coordinating amide auxiliary using h as the sole oxidant was developed. This reaction is compatible with a wide range of heterocycles including pyridines, imidazoles, oxazoles, thiazoles, isoxazoles, and pyrazoles.
Although chelation-assisted C–H olefination has been intensely investigated, Pd(II)-catalyzed C–H olefination reactions are largely restricted to acrylates and styrenes. Here we report a quinoline-derived ligand that enables the Pd(II)-catalyzed olefination of the C(sp2)–H bond with simple aliphatic alkenes using a weaklycoordinating monodentate amide auxiliary. Oxygen is used as the terminal oxidant with
尽管螯合辅助的 C-H 烯化反应已得到深入研究,但 Pd( II ) 催化的 C-H 烯化反应主要限于丙烯酸酯和苯乙烯。在这里,我们报道了一种喹啉衍生的配体,它能够使用弱配位单齿酰胺辅助剂,使简单的脂肪族烯烃与 Pd( II ) 催化的 C(sp 2 )–H 键发生烯化反应。使用氧气作为终端氧化剂,并使用催化铜作为助氧化剂。脂肪族烯烃中的多种官能团是可以耐受的。氢化后,可获得邻位烷基化产物。药物分子的后期多样化也证明了该反应的实用性。
Palladium-catalyzed direct ortho-alkynylation of aryl acetamides with low catalyst loading
The palladium-catalyzed alkynylation of phenylacetic acid derivatives using 4-CF3C6F4NH2 as the auxiliary is described. The reaction efficiency can be greatly promoted by pyridine ligand, which enables the reaction to proceed at a catalystloading as low as 1 mol%. Various functional groups are tolerated under the reaction conditions. The kinetic studies show that the rate of the reaction is first
描述了使用4-CF 3 C 6 F 4 NH 2作为辅助剂的钯催化的苯乙酸衍生物的炔基化反应。吡啶配体可以大大提高反应效率,这使得反应可以在低至1 mol%的催化剂负载下进行。在反应条件下容许各种官能团。动力学研究表明,在苯乙酰胺中,反应速率为一级反应,吡啶配体的组合中的Pd(OAc)2提供了高度耐用且有效的催化剂。