An efficient and metal-free synthesis of biaryls and heterobiaryls has been developed via a key three-component reaction of benzylideneacetones, isopropenyl acetate and methyl propiolate under high pressure (9 Kbar) and mild reaction temperature (40 °C) conditions. The described synthetic protocol provide rapid access to novel, highly functionalized and metal-uncontamined 1,1'-biaryls and heterobiaryls
Oxidative Asymmetric Formal Aza-Diels–Alder Reactions of Tetrahydro-β-carboline with Enones in the Synthesis of Indoloquinolizidine-2-ones
作者:Xiang Wu、Shi-Bao Zhao、Lang-Lang Zheng、You-Gui Li
DOI:10.3390/molecules23092228
日期:——
Ru-catalyzed tandem amine oxidative dehydrogenation/formal aza-Diels⁻Alder reaction for enantio- and diastereoselective synthesis of indoloquinolizidine-2-ones from tetrahydro-β-carbolines and α,β-unsaturated ketones is described. The reaction proceeds viatandem ruthenium-catalyzed amine dehydrogenation using tert-butyl hydroperoxide (TBHP) as the oxidant and a chiral thiourea-catalyzed formal aza-[4
Effects of Ligand Substitution on the Optical and Electrochemical Properties of (Pyridinedipyrrolide)zirconium Photosensitizers
作者:Yu Zhang、Dylan C. Leary、Anne M. Belldina、Jeffrey L. Petersen、Carsten Milsmann
DOI:10.1021/acs.inorgchem.0c02343
日期:2020.10.19
tetrahydrofuran (THF) solution, which allowed the isolation of photoluminescent, eight-coordinate Zr(HPDPH)2(THF)2. The photoredox catalytic dehalogenation of aryl iodides and aryl chlorides using the most reducing derivative, Zr(MePDPMe)2, highlights the potential of Zr(PDP)2 photosensitizers to promote challenging reductive transformations under mild conditions upon excitation with green light.
一系列七个双(吡啶并二吡咯烷)锆配合物Zr(R 1 PDP R 2)2,其中[ R 1 PDP R 2 ] 2–是[2,6-bis(5-R 1 -3 )的双去质子化形式-R 2 -1 H-吡咯-2-基)吡啶]的制备,并通过NMR,UV / vis吸收,发射光谱和循环伏安法在溶液中表征。通过单晶X射线晶体学确定分子结构。所有配合物表现出具有高的量子效率显着地长发射寿命(τ= 190-576微秒)(Φ PL= 0.10–0.38)在苯溶液中用可见光激发。吡咯环上的取代基显示出对这些化合物的光致发光和电化学性质具有显着影响。R 2取代基(R 2 = H,Me,Ph或C 6 F 5)对络合物的吸收和发射曲线仅显示有限的影响,但允许在一定范围内系统地调节基态和激发态氧化还原电势接近600 mV。R 1取代基(R 1 = H,Me,Ph或2,4,6-Me 3 Ph)通过电子效应影响光学和电化学性质。此外,R
Solventless Wittig Olefination with Fluorinated Benzaldehydes
作者:Thies Thiemann
DOI:10.3184/030823407x225464
日期:2007.6
Fluorinated benzaldehydes undergo solventless Wittig olefination with stabilisedphosphoranes. Even with less reactive, stabilisedphosphoranes, such as acetylmethylidenetriphenylphosphorane, the reactions have been found to be exothermic.
Synthesis and cell growth inhibitory properties of substituted (E)-1-phenylbut-1-en-3-ones
作者:Sylvie Ducki、John A. Hadfield、Lucy A. Hepworth、Nicholas J. Lawrence、Ching-Ying Liu、Alan T. McGown
DOI:10.1016/s0960-894x(97)10147-0
日期:1997.12
A series of (E)-1-phenylbut-1-en-3-ones, based on the naturally occurring (E)-1-(4'-hydroxyphenyl)but-1-en-3-one [IC50 (K562) 60 mu M], was synthesised and screened for cytotoxic activity against the K562 human leukaemia cell line. (E)-1-(Pentafluorophenyl)but-1-en-3-one [IC50 (K562) 1.8 mu M] was found to be over 30-fold more active than 1. (C) 1997 Elsevier Science Ltd.