NiH‐Catalyzed Migratory Defluorinative Olefin Cross‐Coupling: Trifluoromethyl‐Substituted Alkenes as Acceptor Olefins to Form
<i>gem</i>
‐Difluoroalkenes
a NiH-catalyzed migratory defluorinative coupling between two electronically differentiated olefins. A broad range of unactivated donor olefins can be joined directly to acceptor olefins containing an electron-deficient trifluoromethyl substituent in both intra- and intermolecular fashion to form gem-difluoroalkenes. This migratory coupling shows both site- and chemoselectivity under mild conditions
Aluminum Hydroxide Secondary Building Units in a Metal–Organic Framework Support Earth-Abundant Metal Catalysts for Broad-Scope Organic Transformations
作者:Xuanyu Feng、Pengfei Ji、Zhe Li、Tasha Drake、Pau Oliveres、Emily Y. Chen、Yang Song、Cheng Wang、Wenbin Lin
DOI:10.1021/acscatal.9b00259
日期:2019.4.5
suggested σ-bond metathesis as a key step for the MIL-53(Al)-CoH-catalyzed addition reactions. MIL-53(Al)-FeCl competently catalyzed oxidative Csp3–H amination and Wacker-type alkene oxidation. XANES analysis revealed the oxidation of FeII to FeIII centers in the activated MIL-53(Al)-FeCl catalyst and suggested that oxidative Csp3–H amination occurs via the formation of FeIII–OtBu species by single electron
氧化铝(Al 2 O 3)表面的固有异质性对氧化铝负载的单中心非均相催化剂的开发提出了挑战,并阻碍了在分子水平上催化物种的表征以及对催化反应机理细节的阐明。 。这里,我们报告与式Al(μ在MIL-53(Al)的金属-有机骨架(MOF)的使用氢氧化铝次级结构单元的(事业部)2 -OH)(BDC)(BDC = 1,4-苯二甲酸)作为Al 2 O 3表面的均匀且在结构上定义的功能模拟物,用于负载地球富集金属(EAM)催化剂。该μ 2MIL-53(Al)SBU中的-OH基很容易去质子化,并用CoCl 2和FeCl 2金属化,从而得到MIL-53(Al)-CoCl和MIL-53(Al)-FeCl预催化剂,其特征在于粉末X射线衍射,氮吸附,元素分析,密度泛函理论和扩展X射线精细结构光谱学。用NaBEt 3 H活化将MIL-53(Al)-CoCl转化为MIL-53(Al)-CoH,可有效催化炔烃和腈的硼
A Catalytic Approach for Enantioselective Synthesis of Homoallylic Alcohols Bearing a <i>Z</i>-Alkenyl Chloride or Trifluoromethyl Group. A Concise and Protecting Group-Free Synthesis of Mycothiazole
作者:Ryan J. Morrison、Farid W. van der Mei、Filippo Romiti、Amir H. Hoveyda
DOI:10.1021/jacs.9b11178
日期:2020.1.8
catalytic processes and is expected to facilitate the preparation of bioactive organic molecules. More specifically, Z-chloro-substituted allylic pinacolatoboronate is first obtained through stereoretentive cross-metathesisbetween Z-crotyl-B(pin) (pin = pinacolato) and Z-dichloroethene, both of which are commercially available. The organoboron compound may be used in the central transformation of the entire
Here, we report the synthesis of all major 2-alkyl-4(1H)-quinolone N-oxide classes of Pseudomonas and Burkholderia, quantification of their native production levels and their antibiotic activities against competing Staphylococcus aureus.
Deprotonation of a trimethylsilylmethaneboronic ester
作者:Donald S. Matteson、Debesh Majumdar
DOI:10.1039/c39800000039
日期:——
Deprotonation of pinacol trimethylsilylmethaneboronate yields an anion which reacts with carbonyl compounds to form alkeneboronic esters, or with alkyl halides to form α-trimethylsilylalkaneboronic esters.