羰基的自然可用性为有效的烯烃合成提供了还原性羰基偶联的巨大合成潜力,但催化羰基的交叉偶联仍然很难实现。我们在本文中报道了在钌(II)催化下由肼介导的这种反应。该方法能够以分子间或分子内的方式使两种不对称羰基化合物容易且选择性地交叉偶联。此外,该化学物质可容纳多种底物,在温和的反应条件下以良好的官能团耐受性进行,并产生化学计量的良性副产物。重要的是,KO t Bu和双齿膦dmpe的共存对于这种转化至关重要。
Expedient carbonylation of aryl halides in aqueous or neat condition
摘要:
An expedient and versatile, microwave-assisted procedure for the carbonylation of aryl halides with boronic acids, alcohols or amines in water or under neat conditions has been developed. The reaction is catalyzed by fluorous, oxime-based palladacycle 1 that shows an excellent recyclable property and low levels of Pd leaching. To demonstrate the usefulness of the protocol, we applied it to the preparation of compounds of pharmaceutical interest, including a precursor of the reverse transcriptase inhibitor, niacin, benzocaine and butamben. (C) 2014 Elsevier Ltd. All rights reserved.
Transition metal‐catalyzed aminocarbonylation of aryl halides with CO and amines, pioneered by Heck and co‐workers in the 1970s, is among the most commonly employed reactions to make aromatic amides. A catalyst‐free aminocarbonylation of aryliodides with CO and amines, which simply uses photoirradiation conditions by Xe‐lamp, has now been developed. This methodology shows broad functional‐group tolerance
A palladium-catalysed aminocarbonylation of (hetero)aryliodides has, for the first time, been accomplished in deep eutectic solvents as environmentally benign and recyclable media, under mild conditions. The reactions proceeded with a good substrate scope, and a variety of amides have been synthesized in yields up to 98%.
Aminocarbonylation of aryl iodides with primary and secondary amines in aqueous medium using polymer supported palladium-N-heterocyclic carbene complex as an efficient and heterogeneous recyclable catalyst
作者:Ziyauddin S. Qureshi、Santosh A. Revankar、Mayur V. Khedkar、Bhalchandra M. Bhanage
DOI:10.1016/j.cattod.2012.03.039
日期:2012.12
secondary aromatic/aliphaticamines to corresponding amides using polymer supported palladium-N-heterocyclic carbene complex (PS-Pd-NHC) as an efficient heterogeneous, recyclablecatalyst is described. The catalytic system was optimized with respect to various reaction parameters to give excellent yield of desired products. The catalyst can be easily separated by simple filtration process and recycled further