Base-mediated benzannulation of α-cyanocrotonates with ynones: facile synthesis of benzonitriles and fluorenes
作者:Maneesh Kumar Reddy Singam、Attunuri Nagireddy、Sridhar Reddy Maddi
DOI:10.1039/d0gc00608d
日期:——
Benzonitriles and cyanofluorenes have been rapidly obtained via the [3 + 3] benzannulation of readily available alkynones and α-cyanocrotonates using KOtBu as the only reagent and EtOH (and CO2) is the only by-product.
The carbonylation of alkanes 1 under radical-reaction conditions was examined by using ethynyl triflone A as the unimolecular chain-transfer (UMCT) reagent. Good to moderate yields of ethynylketones 2 were prepared by means of this three-component coupling reaction. Higher CO pressures as well as lower concentrations of triflone A improved the efficiency of the reaction over the direct addition, the
Visible‐light‐induced photocatalytic decarboxylativealkynylations of carboxylicacids have been developed for the first time. The reaction features extremely mild conditions, broad substrate scope, and avoids additional oxidants. Importantly, a decarboxylative carbonylative alkynylation has also been carried out in the presence of carbon monoxide (CO) under photocatalytic conditions, which affords
A facile and rapid route for the synthesis of Cu/Cu<sub>2</sub>O nanoparticles and their application in the Sonogashira coupling reaction of acyl chlorides with terminal alkynes
作者:Manohar A. Bhosale、Takehiko Sasaki、Bhalchandra M. Bhanage
DOI:10.1039/c4cy00868e
日期:——
solvent. The 1,3-propanediol plays multiple roles in the reaction including solvent, reactant, promoter and capping agent, and there is no need for any other additives. A structural and morphological study of the Cu/Cu2O NPs was carried out using XRD, FEG-SEM, EDS, TEM, FT-IR, DSC-TGA and TPR techniques. This is one of the simpler, faster, less expensive and greener approaches for the synthesis of nanocrystalline
我们已经证明了通过微波方法制备Cu / Cu 2 O纳米颗粒(NPs)的简便的一步合成策略。微波能量是合成Cu / Cu 2 O NPs的驱动力,这使该过程经济。在当前方法中,使用乙酸铜(II)作为前体和1,3-丙二醇作为溶剂,在三分钟内合成了Cu / Cu 2 O NP 。1,3-丙二醇在反应中起多种作用,包括溶剂,反应物,促进剂和封端剂,并且不需要任何其他添加剂。Cu / Cu 2的结构和形态研究使用XRD,FEG-SEM,EDS,TEM,FT-IR,DSC-TGA和TPR技术进行O NP。这是用于合成纳米晶体Cu / Cu 2 O的更简单,更快,更便宜和更环保的方法之一。此外,纳米晶体Cu / Cu 2 O在炔烃与酰氯的Sonogashira偶联反应中显示出出色的催化活性。
Visible-light-mediated photocatalytic cross-coupling of acetenyl ketones with benzyl trifluoroborate
作者:Lingchun Zhang、Yanle Chu、Peizhi Ma、Shujuan Zhao、Qiaoyan Li、Boya Chen、Xuejiao Hong、Jun Sun
DOI:10.1039/c9ob02624j
日期:——
In this report, we describe a simple visible light-triggered Barbier-type reaction by employing acetenyl ketones with benzyl trifluoroborates. Through a radical-radical cross-coupling process, this photocatalytic protocol furnished a wide range of tertiary propargyl alcohols. Mechanistic investigation indicated that proton-coupled electron transfer (PCET) might be involved in the photochemical transformations