One-pot cascade synthesis of α-diketones from aldehydes and ketones in water by using a bifunctional iron nanocomposite catalyst
作者:Tao Song、Xin Zhou、Xiaoxue Wang、Jianliang Xiao、Yong Yang
DOI:10.1039/d0gc03739g
日期:——
A new methodology for the synthesis of α-diketones was reported via a one-pot cascade process from aldehydes and ketones catalyzed by a bifunctional iron nanocompositeusing H2O2 as a green oxidant in water. The one-pot strategy showed excellent catalytic stability, comprehensive suitability of substrates and important practical utility for directly synthesizing biologically active and medicinally
据报道,通过双锅铁纳米复合物在水中使用H 2 O 2作为绿色氧化剂,通过醛和酮的一锅级联过程,合成了一种合成α-二酮的新方法。一锅法显示出优异的催化稳定性,底物的全面适用性和重要的实际实用性,可通过间歇过程直接合成具有生物活性和医学价值的N-杂环。
Substituent Effect in the Synthesis of α,α‐Dibromoketones, 1,2‐Dibromalkenes, and 1,2‐Diketones from the Reaction of Alkynes and Dibromoisocyanuric Acid
作者:Eunjeong Cho、Aravindan Jayaraman、Junseong Lee、Kyoung Chul Ko、Sunwoo Lee
DOI:10.1002/adsc.201801535
日期:2019.4.16
dibromoisocyanuric acid/H2O to afford α,α‐dibromoketone and 1,2‐diketone derivatives. Diarylalkynes with activating groups provided 1,2‐diketone derivatives as the major products, whereas diarylalkynes with a non‐activating group or alkylarylalkynes gave α,α‐dibromoketone derivatives as the major products. In addition, diarylalkynes with deactivating groups provided 1,2‐dibromoalkenes. The reaction was conducted at
内部炔烃与二溴异氰尿酸/ H 2 O反应,得到α,α-二溴酮和1,2-二酮衍生物。具有活化基团的二芳基炔烃提供1,2-二酮衍生物作为主要产物,而具有非活化基团的二芳基炔烃或烷基芳基炔烃提供的α,α-二溴酮衍生物为主要产物。此外,带有失活基团的二芳基炔烃可提供1,2-二溴烯烃。该反应在室温下进行,并且在大多数情况下显示出良好的产率。已经基于实验观察和密度泛函理论(DFT)计算提出了反应途径。
Catalyst-Free and Transition-Metal-Free Approach to 1,2-Diketones via Aerobic Alkyne Oxidation
A catalyst-free and transition-metal-free method for the synthesis of 1,2-diketones from aerobic alkyne oxidation was reported. The oxidation of various internal alkynes, especially more challenging aryl-alkyl acetylenes, proceeded smoothly with inexpensive, easily handled, and commercially available potassium persulfate and an ambient air balloon, achieving the corresponding 1,2-diketones with up
Dimethyl Sulfoxide as an Oxygen Atom Source Enabled Tandem Conversion of 2‐Alkynyl Carbonyls to 1,2‐Dicarbonyls
作者:Yuan Lu、Mu‐Jia Luo、Ming Hu、Yang Li、Jin‐Heng Li
DOI:10.1002/adsc.202000066
日期:2020.4.27
compounds by means of a CuBr2/I2/DMSO/water system is developed, enabling the fromation of various functionalized 1,2‐dicarbonyl compounds, including 1,2‐diketones, α‐keto amides and α‐keto ester. This Cu‐promoted iodine‐mediated tandem procedure employs DMSO as the oxygen atom source of the formed carbonyl group through iodonium ion formation, nucleophilic DMSO addition and C−C bond cleavage cascades.
开发了通过CuBr 2 / I 2 / DMSO /水系统串联2-炔基羰基化合物的方法,使各种官能化的1,2-二羰基化合物(包括1,2-二酮,α-酮酰胺)形成和α-酮酸酯 此铜促进的碘介导的串联过程使用DMSO作为碘原子离子形成,亲核DMSO加成和CC键断裂级联反应形成的羰基的氧原子源。
Selectfluor-Mediated Simultaneous Cleavage of C–O and C–C Bonds in α,β-Epoxy Ketones Under Transition-Metal-Free Conditions: A Route to 1,2-Diketones
作者:Heng Wang、Shaobo Ren、Jian Zhang、Wei Zhang、Yunkui Liu
DOI:10.1021/acs.joc.5b00857
日期:2015.7.2
Selectfluor-mediated simultaneous cleavage of C–O and C–C bonds in α,β-epoxyketones has been successfully achieved under transition-metal-free conditions. The reaction gives 1,2-diketone compounds in moderate to good yields involving a ring-opening/benzoyl rearrangement/C–C bond cleavage sequence under oxidative conditions.