Ir(III)-Catalyzed Oxidative Annulation of Phenylglyoxylic Acids with Benzo[<i>b</i>]thiophenes
作者:Zhigang Wang、Mufan Yang、Yudong Yang
DOI:10.1021/acs.orglett.8b01033
日期:2018.5.18
An Ir(III)-catalyzed oxidative annulation of phenylglyoxylic acids with benzo[b]thiophenes for the construction of benzothieno[3,2-c][2]benzopyranones in one step is disclosed. Three C–H cleavages and C–C/C–O bondformations are involved in this reaction. This protocol features a relatively broad substrate scope, good functional group tolerance, good regioselectivities, mild reaction conditions, and
公开了一种Ir(III)催化的苯乙醛酸与苯并[ b ]噻吩的氧化环化反应,用于一步法构建苯并噻吩并[3,2- c ] [2]苯并吡喃酮。该反应涉及三个C–H裂解和C–C / C–O键的形成。该方案具有相对较宽的底物范围,良好的官能团耐受性,良好的区域选择性,温和的反应条件和按比例放大的合成。
Copper-catalyzed direct alkylation of heteroarenes
作者:Cédric Theunissen、Jianjun Wang、Gwilherm Evano
DOI:10.1039/c6sc05622a
日期:——
process is reported for the directalkylation of C–H bonds in heteroarenes, privileged scaffolds in many areas of science. This reaction is based on the copper-catalyzed addition of alkyl radicals generated from activated secondary and tertiary alkyl bromides to a wide range of arenes, including furans, thiophenes, pyrroles, and their benzo-fused derivatives, as well as coumarins and quinolinones.
Solid-state Suzuki–Miyaura cross-coupling reactions: olefin-accelerated C–C coupling using mechanochemistry
作者:Tamae Seo、Tatsuo Ishiyama、Koji Kubota、Hajime Ito
DOI:10.1039/c9sc02185j
日期:——
The Suzuki-Miyaura cross-coupling reaction is one of the most reliable methods for the construction of carbon-carbon bonds in solution. However, examples for the corresponding solid-state cross-coupling reactions remain scarce. Herein, we report the first broadly applicable mechanochemical protocol for a solid-state palladium-catalyzed organoboron cross-coupling reaction using an olefin additive. Compared
铃木-宫浦交叉偶联反应是在溶液中构建碳-碳键的最可靠的方法之一。然而,相应的固态交叉偶联反应的例子仍然很少。在此,我们报告了第一个广泛适用的使用烯烃添加剂进行固态钯催化有机硼交叉偶联反应的机械化学方案。与之前的研究相比,新开发的方案显示出显着拓宽的底物范围。我们的机理数据表明,烯烃添加剂可能充当钯基催化剂的分散剂,以抑制纳米颗粒的更高聚集,也可以充当活性单体 Pd(0) 物质的稳定剂,从而促进这些具有挑战性的固态 CC 键形成交叉-偶联反应。
Cascade Oxidative C−H Annulation of Thiophenes: Heck‐Type Pathway Enables Concise Access to Thienoacenes
作者:Xingyu Chen、Yudong Yang、Weiguo Han、Quan Huang、Zhenmei Huang、Jingsong You
DOI:10.1002/anie.202103160
日期:2021.5.25
pursuit of efficient synthetic route to thienoacenes represents an appealing yet challenging task in the fields of both organic synthetic chemistry and organic functional materials. In this work, we disclose a rhodium‐catalyzed cascadeC−Hannulation of phenacyl phosphoniums with (benzo)thiophenes via a Heck‐typepathway to provide a new class of planar thienoacenes, which involves the formation of three
General approach to benzo[b]thiophenes, benzo[b]furans, and dibenzofurans via gold-catalyzed cyclization of 1-heteroarylalka-2,3-dienyl acetates
作者:Youai Qiu、Dengke Ma、Chunling Fu、Shengming Ma
DOI:10.1016/j.tet.2013.04.099
日期:2013.7
mild route to a series of benzo[b]thiophenes, benzo[b]furans, and dibenzofurans through gold-catalyzed benzannulation of 1-heteroarylalka-2,3-dienyl acetates was developed. Two possible pathways of this reaction involving gold carbene and aryl gold intermediates have been proposed on the basis of mechanisticstudies.
通过金催化的1-杂芳基烷基-2,3-二烯基乙酸酯的苯并环烷基化反应,开发了一种高效温和的途径来制备一系列苯并[ b ]噻吩,苯并[ b ]呋喃和二苯并呋喃。在机理研究的基础上,提出了该反应涉及金卡宾和芳基金中间体的两种可能途径。