Ni/Cu-Catalyzed Decarboxylative Addition of Alkynoic Acids to Terminal Alkynes for the Synthesis of <i>gem</i>-1,3-Enynes
作者:Sehyeon Han、Han-Sung Kim、Maosheng Zhang、Yuanzhi Xia、Sunwoo Lee
DOI:10.1021/acs.orglett.9b01625
日期:2019.7.19
The synthesis of gem-1,3-enynes via Ni/Cu-catalyzed decarboxylative addition of alkynoic acids to terminalalkynes has been developed. It was found that the decarboxylation of an alkynoic acid led predominantly to gem-1,3-enynes instead of 1,3-diynes, which have been known to be formed through the coupling of terminalalkynes. A variety of gem-1,3-enynes were obtained in good yields. This catalytic
Decarboxylative Tribromination for the Selective Synthesis of Tribromomethyl Ketone and Tribromovinyl Derivatives
作者:Aravindan Jayaraman、Eunjeong Cho、Jimin Kim、Sunwoo Lee
DOI:10.1002/adsc.201800851
日期:2018.10.18
Tribromomethyl ketone and tribromovinyl derivatives were selectively prepared from the decarboxylative tribromination. The reaction between propiolic acid derivatives and dibromoisocyanuric acid (DBCA)/H2O afforded predominantly a tribromomethyl ketonederivative in the presence of AgOAc (10 mol%). When the same reaction was conducted with 2,2,6,6‐tetramethyl‐1‐piperidinyloxy (TEMPO) instead of AgOAc
由脱羧三溴化作用选择性地制备三溴甲基酮和三溴乙烯基衍生物。在AgOAc(10mol%)存在下,丙酸衍生物与二溴异氰尿酸(DBCA)/ H 2 O之间的反应主要得到三溴甲基酮衍生物。当用2,2,6,6-四甲基-1-哌啶基氧基(TEMPO)代替AgOAc进行相同的反应时,仅以高收率形成了三溴乙烯基衍生物。发现乙炔基溴是中间体。
Palladium-catalyzed decarboxylative coupling reaction with alkynyl carboxylic acids and arylsiloxanes
作者:Jisun Jang、Gabriel Charles Edwin Raja、Ju-Hyeon Lee、Yujeong Son、Jimin Kim、Sunwoo Lee
DOI:10.1016/j.tetlet.2016.08.095
日期:2016.10
A decarboxylative coupling reaction for alkynyl carboxylic acids and arylsiloxanes was developed using a palladium catalyst. This method provided the desired coupled products in moderate to good yields by reacting the alkynyl carboxylic acids and arylsiloxanes with Pd(dba)2 (1.0 mol %), 1,1-bis(diphenylphosphino)methane (1.0 mol %), and AgF2 (2.0 equiv) at 60 °C for 6 h.
Decarboxylative Oxyacyloxylation of Propiolic Acids: Construction of Alkynyl-Containing α-Acyloxy Ketones
作者:Xin Chen、Yangchun Xin、Zhi-Wei Zhao、Yu-Jian Hou、Xiang-Xiang Wang、Wen-Jin Xia、Ya-Min Li
DOI:10.1021/acs.joc.1c00669
日期:2021.6.18
Novel decarboxylative oxyacyloxylation of propiolic acids has been developed. This reaction provides an efficient access to alkynyl-containing α-acyloxy ketones from readily available starting materials and exhibits significant functional group tolerance. Furthermore, oxyacyloxylation of terminal alkynes and aliphatic propiolic acids was also developed. A possible reaction mechanism is proposed based
with an exact number of atoms are of particular interest in catalysis. Their catalytic behaviors can be potentially altered with the addition or removal of a singleatom. Now the effects of doping with a singleforeignatom (Au, Pd, and Pt) into the core of an Ag cluster with 25 atoms on the catalytic properties are explored, where the foreignatom is protected by 24 Ag atoms (Au@Ag24, Pd@Ag24, and
在催化中,具有确切原子数的簇特别受关注。它们的催化行为可以通过添加或去除单个原子来潜在地改变。现在,研究了用单个外来原子(Au,Pd和Pt)掺杂到具有25个原子的Ag团簇的核中对催化性能的影响,其中外来原子受24个Ag原子保护(Au @ Ag 24,Pd @ Ag 24和Pt @ Ag 24)。单个原子向Ag 25团簇的中心掺杂对CO 2羧化反应中的催化性能有很大影响。与末端炔烃通过C-C键形成而生成丙酸。这些研究表明,通过远离活性中心的单个原子的细微变化,簇状催化剂的催化性能会发生显着变化。