Catalytic Activity of a Zr MOF Containing P<sup>O</sup>C<sup>O</sup>P-Pd Pincer Complexes
作者:Abebu A. Kassie、Casey R. Wade
DOI:10.1021/acs.organomet.0c00164
日期:2020.6.22
terminal alkyne hydration, and intramolecularhydroarylation of alkynes. The homogeneous analogue, tBu4POCOP-PdBF4, shows poor catalytic activity for transfer hydrogenation and alkyne hydration and decomposes under the catalytic reaction conditions. Solubility limitations and catalyst deactivation pathways observed for the homogeneous pincer complex propound the advantages of using porous solid supports
由P O C O P-Pd夹钳复杂金属交联剂(1-PdBF 4,Zr 6 O 4(OH)4(L-PdMeCN)3(BF 4)3,L =(2,6- (OPAR 2)2 C ^ 6 ħ 3中,Ar = p -C 6 H ^ 4 CO 2 - )已经经由合成后氧化生成的I - / BF 4 -与NOBF配体交换4。1-PDBF 4催化一系列有机转化,包括不饱和有机底物的转移氢化,末端炔烃水合和炔烃的分子内氢化。均相类似物t Bu 4 P O C O P-PdBF 4显示出对转移氢化和炔烃水合作用的不良催化活性,并在催化反应条件下分解。均相钳子配合物的溶解度限制和催化剂失活途径证明了使用多孔固体载体固定有机金属物质的优势。
Iridium(<scp>iii</scp>)-catalysed annulation of pyrazolidinones with propiolates: a facile route to pyrazolo[1,2-<i>a</i>] indazoles
作者:Zi Yang、Zhenyu Song、Lianghua Jie、Lianhui Wang、Xiuling Cui
DOI:10.1039/c9cc02232e
日期:——
A facile synthesis of various pyrazolo[1,2-a] indazoles from pyrazolidinones and propiolates via iridium(III)-catalysed C–H bond activation/subsequent [4+1] cyclization has been developed. The reaction proceeds smoothly under mild reactionconditions and propiolates act as a novel C1 synthon. This transformation represents a redox-neutral process, exhibits a highly regioselectivity, and tolerates various
已经开发了一种通过铱(III)催化的C–H键活化/随后的[4 + 1]环化反应从吡唑啉酮和丙酸酯轻松合成各种吡唑并[1,2- a ]吲唑的方法。在温和的反应条件下,反应平稳进行,丙酸酯作为新型C 1合成子。该转变代表氧化还原中性过程,表现出高度的区域选择性,并能耐受各种官能团。
α-Amino Acid Sulfonamides as Versatile Sulfonylation Reagents: Silver-Catalyzed Synthesis of Coumarins and Oxindoles by Radical Cyclization
作者:Kyalo Stephen Kanyiva、Daisuke Hamada、Sohei Makino、Hideaki Takano、Takanori Shibata
DOI:10.1002/ejoc.201800901
日期:2018.11.25
silver‐catalyzed sulfonylation strategy using sulfonamides derived from α‐amino acids is described. The reaction proceeded via decarboxylation, N–S bond cleavage and radical cyclization to provide a variety of coumarins. The reaction was suitable for the synthesis of 2‐oxindoles and an isoquinolinedione by the capturing of the sulfonyl radical with an alkene moiety and cyclization.
A metal-free yne-addition/1,4-aryl migration/decarboxylation cascade reaction of alkynoates with C<sub>sp3</sub>–H centers
作者:De-Long Kong、Liang Cheng、Hong-Ru Wu、Yang-Xiong Li、Dong Wang、Li Liu
DOI:10.1039/c5ob02478a
日期:——
aryl alkynoates with five different types of radical precursors (R–H) through an yne-addition/1,4-aryl migration/decarboxylation process was reported, which allowed facile and convenient access to functionalized vinyl products with “R” and protons located at the identical carbon of the formed double bond.
Direct and metal-free arylsulfonylation of alkynes with sulfonylhydrazides for the construction of 3-sulfonated coumarins
作者:Wei Wei、Jiangwei Wen、Daoshan Yang、Mengyuan Guo、Yingying Wang、Jinmao You、Hua Wang
DOI:10.1039/c4cc08117j
日期:——
A novel and metal-free procedure has been developed for the construction of sulfonated coumarins via direct arylsulfonylation of alkynes with sulfonylhydrazides.