Ir<sup>III</sup>-Catalyzed direct syntheses of amides and esters using nitriles as acid equivalents: a photochemical pathway
作者:Ranadeep Talukdar
DOI:10.1039/d0nj00002g
日期:——
unprecedented IrIII[df(CF3)ppy]2(dtbbpy)PF6-catalyzed simple photochemical process for direct addition of amines and alcohols to the relatively less reactive nitrile triple bond is described herein. Various amides and esters are synthesized as the reaction products, with nitriles being the acid equivalents. A mini-library of different types of amides and esters is made using this mild and efficient process, which
本文描述了空前的Ir III [df(CF 3)ppy] 2(dtbbpy)PF 6催化的简单光化学过程,用于将胺和醇直接加成到反应性较小的腈三键上。合成了各种酰胺和酯作为反应产物,其中腈是酸的当量。使用这种温和有效的方法可以制得不同类型的酰胺和酯的小型文库,该方法在可见光照射下(λ = 445 nm)仅使用1 mol%的光催化剂。该反应策略对于克级合成也是有效的。
Cross-Dehydrogenating Coupling of Aldehydes with Amines/R-OTBS Ethers by Visible-Light Photoredox Catalysis: Synthesis of Amides, Esters, and Ureas
A straightforward synthesis of amides, ureas, and esters is reported by visible-light cross-dehydrogenating coupling (CDC) of aldehydes (or amine carbaldehydes) and amines/R-OTBS ethers by photoredoxcatalysis. The reaction is found to be general and high yielding. A plausible mechanistic pathway has been proposed for these transformations and is supported by appropriate controlled experiments.
chlorides such as MoCl5, WCl6, NbCl5 and TaCl5 were found as very efficient catalysts for acylativecleavage of the C–O bond of ethers. Compared with conventional Lewis acid catalysts such as ZnCl2, AlCl3, SnCl4 and TiCl4, group 5 and 6 metal chlorides showed better results in the catalytic C–O bond cleavage of dibutyl ether with benzoyl chloride.
either a 2-(η5-cyclopentadienyl)(η4-tetraphenylcyclobutadiene)cobalt or a 2-(1,2,3,4,5-pentaphenyl)-ferrocene substituent. The influence of the bulky metallocenes result in these ligands mimicking planarchirality, as demonstrated by their catalysis of the addition of diethylzinc to benzaldehyde resulting in (R)-1-phenylpropanol (75% e.e.).