Herein, we report a highly efficient and practical method for pyridine‐derived heterobiaryl synthesis through palladium‐catalyzed electrophilic functionalization of easily available pyridine‐derived quaternary phosphonium salts. The nice generality of this reaction was goes beyond arylation, enabling facile incorporation of diverse carbon‐based fragments, including alkenyl, alkynyl, and also allyl
Palladium-Catalyzed Synthesis of Ammonium Sulfinates from Aryl Halides and a Sulfur Dioxide Surrogate: A Gas- and Reductant-Free Process
作者:Edward J. Emmett、Barry R. Hayter、Michael C. Willis
DOI:10.1002/anie.201404527
日期:2014.9.15
range of useful molecules and materials, and despite a variety of preparative methods being available, processes which introduce the most basic sulfonyl building block, sulfurdioxide, using catalytic methods, are rare. Described herein is a simple reaction system consisting of the sulfurdioxide surrogate DABSO, triethylamine, and a palladium(0) catalyst for effective convertion of a broad range of
Tetraarylcyclobutadienecyclopentadienylcobalt Complexes: Synthesis, Electronic Spectra, Magnetic Circular Dichroism, Linear Dichroism, and TD DFT Calculations
作者:Gregg S. Kottas、Thierry Brotin、Peter F. H. Schwab、Kamal Gala、Zdeněk Havlas、James P. Kirby、John R. Miller、Josef Michl
DOI:10.1021/om400403j
日期:2014.7.14
a series of its new substituted derivatives have been prepared. The electronic states of a few representatives have been characterized by absorption and magneticcirculardichroism. Time-dependent density functional theory has been used to arrive at spectral assignments for several prominent low-energy bands. The absorption spectra of the radical ions of 1 have also been recorded.
calcium in diethyl ether yields unique cage compound [(Et2O)2Ca(I)2·(Et2O)2Ca(I)(OEt)·(Et2O)Ca(I)(CH2SiMe3)] (3). We demonstrate that alkylcalcium complexes are valuable reagents for calcium–iodine exchange reactions at Csp2–I functionalities.
Synthesis of Aryldiazoacetates through Palladium(0)-Catalyzed Deacylative Cross-Coupling of Aryl Iodides with Acyldiazoacetates
作者:Fei Ye、Chengpeng Wang、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201407653
日期:2014.10.20
Palladium(0)‐catalyzed deacylative cross‐coupling of aryl iodides and acyldiazocarbonyl compounds can be achieved at room temperature under mild reaction conditions. The coupling reaction represents a highly efficient and general method for the synthesis of aryldiazocarbonyl compounds, which have found wide and increasing applications as precursors for generating donor/acceptor‐substituted metallocarbenes