P-Stereogenic Phospholanes or Phosphorinanes from o-Biarylylphosphines: Two Bridges Not Too Far
摘要:
The discovery of a concise regiodivergent asymmetric route to nonclassical P-stereogenic 5- or 6-membered benzophosphacycles, under conditions-dependent radical (oxidative addition) versus anionic (SNAr) benzannulation, is reported.
Biarylphosphonite Gold(I) Complexes as Superior Catalysts for Oxidative Cyclization of Propynyl Arenes into Indan-2-ones
作者:Guilhem Henrion、Thomas E. J. Chavas、Xavier Le Goff、Fabien Gagosz
DOI:10.1002/anie.201301015
日期:2013.6.10
Striking gold: A series of variously functionalized propynyl arenes was smoothly converted into indan‐2‐ones by a new gold(I)‐catalyzed oxidative cyclization process. [LAu]NTf2 (Tf=trifluoromethanesulfonyl) is a superior catalyst both in terms of yield and kinetics for the present transformation.
打击金:通过新的金(I)催化的氧化环化工艺,一系列功能化的丙炔基芳烃被顺利转化为茚满-2-酮。就本转化而言,就收率和动力学而言,[ L Au] NTf 2(Tf =三氟甲磺酰基)是优良的催化剂。
Air-Stable Secondary Phosphine Oxide or Chloride (Pre)Ligands for Cross-Couplings of Unactivated Alkyl Chlorides
作者:Lutz Ackermann、Anant R. Kapdi、Carola Schulzke
DOI:10.1021/ol100658y
日期:2010.5.21
In situ generated and crystallographically well-defined, isolated palladium complexes derived from seven novel air-stable secondary phosphine oxides or chlorides enabled challenging Kumada−Corriu cross-couplings of unactivatedalkylchlorides bearing β-hydrogens and proved applicable to transformations of alkyl-substituted organometallics.
Direct Observation of Aryl Gold(I) Carbenes that Undergo Cyclopropanation, C−H Insertion, and Dimerization Reactions
作者:Cristina García‐Morales、Xiao‐Li Pei、Juan M. Sarria Toro、Antonio M. Echavarren
DOI:10.1002/anie.201814577
日期:2019.3.18
Mesityl gold(I) carbenes lacking heteroatom stabilization or shielding ancillaryligands have been generated and spectroscopically characterized from chloro(mesityl)methylgold(I) carbenoids bearing JohnPhos‐type ligands by chloride abstraction with GaCl3. The aryl carbenes react with PPh3 and alkenes to give stable phosphonium ylides and cyclopropanes, respectively. Oxidation with pyridine N‐oxide and
Pd-Catalyzed Regioselective Branched Hydrocarboxylation of Terminal Olefins with Formic Acid
作者:Wenlong Ren、Mingzhou Wang、Jianqiong Guo、Jintao Zhou、Jianxiao Chu、Yuan Shi、Yian Shi
DOI:10.1021/acs.orglett.1c04231
日期:2022.1.28
A regioselectivePd-catalyzed hydrocarboxylation of terminal olefins with HCOOH is described. A wide variety of branched carboxylic acids can readily be obtained with high regioselectivities under mild reaction conditions. The reaction is operationally simple and requires no handling of toxic CO. The ligand and LiCl are important factors for reaction reactivity and selectivity.
Synthesis of Nonalternating Polyketones Using Cationic Diphosphazane Monoxide-Palladium Complexes
作者:Shi-Yu Chen、Ru-Chao Pan、Min Chen、Ye Liu、Changle Chen、Xiao-Bing Lu
DOI:10.1021/jacs.1c04964
日期:2021.7.21
solvents and high melting temperature (Tm ∼ 260 °C) resulting from the strictly alternative structure. Nonalternating copolymerization of ethylene with CO is a very promising method to circumvent the problem of processability of traditional perfectly alternating polyketone. In the contribution, the palladium coordinated diphosphazane monoxide substituted by strong electron-donating groups is discovered