Selective Synthesis of <i>Z</i>-Silyl Enol Ethers via Ni-Catalyzed Remote Functionalization of Ketones
作者:Sinem Guven、Gourab Kundu、Andrea Weßels、Jas S. Ward、Kari Rissanen、Franziska Schoenebeck
DOI:10.1021/jacs.1c01797
日期:2021.6.9
the Z-selective synthesis of silyl enol ethers of (hetero)aromatic and aliphatic ketones via Ni-catalyzed chain walking from a distant olefin site. The positional selectivity is controlled by the directionality of the chain walk and is independent of thermodynamic preferences of the resulting silyl enol ether. Our mechanistic data indicate that a Ni(I) dimer is formed under these conditions, which
我们报告了一种远程官能化策略,该策略允许通过 Ni 催化的链从远处的烯烃位点步行来Z选择性合成(杂)芳族和脂肪族酮的甲硅烷基烯醇醚。位置选择性由链游走的方向性控制,并且与所得甲硅烷基烯醇醚的热力学偏好无关。我们的机理数据表明,在这些条件下形成Ni (I)二聚体,作为催化剂静止状态,并在与烷基溴反应后转化为 [Ni (II) -H] 作为活性链行走/功能化催化剂,最终生成稳定的 η 3 键合Ni (II) 烯醇作为关键的选择性控制中间体。
Pd-catalyzed domino carbonylative–decarboxylative allylation: an easy and selective monoallylation of ketones
作者:Steven Giboulot、Frédéric Liron、Guillaume Prestat、Benoit Wahl、Mathieu Sauthier、Yves Castanet、André Mortreux、Giovanni Poli
DOI:10.1039/c2cc32391e
日期:——
In the presence of an allyl alcohol, α-chloroacetophenones undergo an allyloxycarbonylation reaction followed by in situ decarboxylative allylation to selectively afford the corresponding monoallylated ketones via a Pd-catalyzed domino sequence. The scope of the reaction was extended to substituted α-chloroacetophenones as well as various allyl alcohols.
Redox-Triggered Ruthenium-Catalyzed Remote C–H Acylation with Primary Alcohols
作者:Xiao Guo、Yang Wu、Gongqiang Li、Ji-Bao Xia
DOI:10.1021/acscatal.0c03343
日期:2020.11.6
related compounds. Prior examples for hydrogenative remote C(sp3)–H functionalization of olefins via a metal walking process featured external reducing agents. Here, we report a strategy for redox-triggered hydrogenative remote C(sp3)–H acylation of olefins with primary alcohols both as an acylating agent and a reductant, which is validated by the base-free 1,3-diketone synthesis. Mechanistic studies have
Cross-Coupling Reaction of α-Chloroketones and Organotin Enolates Catalyzed by Zinc Halides for Synthesis of γ-Diketones
作者:Makoto Yasuda、Shoki Tsuji、Yusuke Shigeyoshi、Akio Baba
DOI:10.1021/ja0258172
日期:2002.6.1
catalyzed by zinc halides. In contrast to the exclusive formation of 1,4-diketones 3 under catalytic conditions, uncatalyzed reaction of 1 with 2 gave aldol-type products 4 through carbonyl attack. NMR study indicates that the catalyzed reaction includes precondensation between tin enolates and α-haloketones providing an aldol-type species and their rearrangement of the oxoalkyl group with leaving halogen