Visible-light-induced dearomative oxamination of indole derivatives and dearomative amidation of phenol derivatives
作者:Lingang Wu、Yanan Hao、Yuxiu Liu、Haibin Song、Qingmin Wang
DOI:10.1039/d0cc03506h
日期:——
oxamination reactions of indolederivatives to afford functionalized spirocyclic products. These step-economical reactions, which involve C–N and C–O bond formation, feature mild conditions, a broad substrate scope, high yields, exclusive diastereoselectivity and step-economy. In addition, a similar protocol could be used to synthesize spirolactams by dearomative amidation of phenol derivatives.
A new radical-mediated intramolecular arene C(sp2)-H amidation of 3-phenylpropanamides or [1,1'-biphenyl]-2-carboxamides was developed to prepare a series of 3,4-dihydro-2(1H)-quinolinone and phenanthridone derivatives in moderate to excellent yields (33-94%). Spirolactams could also be obtained using this protocol.
Antagonism of Quorum Sensing Phenotypes by Analogs of the Marine Bacterial Secondary Metabolite 3-Methyl-N-(2′-Phenylethyl)-Butyramide
作者:Susan M. Meschwitz、Margaret E. Teasdale、Ann Mozzer、Nicole Martin、Jiayuan Liu、Stephanie Forschner-Dancause、David C. Rowley
DOI:10.3390/md17070389
日期:——
3-methyl-N-(2'-phenylethyl)-butyramide, produced by a marine bacterium identified as Halobacillus salinus, inhibits QS controlled phenotypes in multiple Gram-negative reporter strains. Here we report that N-phenethyl hexanamide, a structurally-related compound produced by the marine bacterium Vibrio neptunius, similarly demonstrates QS inhibitory properties. To more fully explore structure-activity relationships
Enantioselective β-C(sp<sup>3</sup>)–H arylation of amides<i>via</i>synergistic nickel and photoredox catalysis
作者:Wu Zhang、Xiaomin Shu、Leitao Huan、Buqing Cheng、Haohua Huo
DOI:10.1039/d1ob01774h
日期:——
An enantioselective benzylic β-C(sp3)–Harylation of amides via synergistic nickel and photoredoxcatalysis is reported. The C–H bond is activated by a bromine-radical-mediated C–H cleavage. This mild yet straightforward protocol provides arylation products in up to 96% yield and with up to 95% ee.
Efficient and stable tripodal Phosphine-Controlled Pd-Catalyst for anti-Markovnikov hydroaminocarbonylation of alkenes with aromatic amines
作者:Xiao-Chao Chen、Tian Lan、Jian Zhu、Sibin Ying、Guang-Hui Shi、Kai-Chun Zhao、Lin Guo、Yong Lu、Ye Liu
DOI:10.1016/j.jcat.2023.01.022
日期:2023.2
1-tris(diphenylphosphino-methyl)ethane] was applied to control the activity, regioselectivity, and stability of the involved Pd-catalyst in anti-Markovnikov hydroaminocarbonylation of alkenes with aromaticamines for the synthesis of linear-amides. Due to the unique characters of L1 in terms of the steric bulkiness, the switching-coordination mode from tripodal phosphine to bidental one, and the robustness
三足膦 [ L1 , 1,1,1-tris(diphenylphosphino-methyl)ethane] 用于控制所涉及的 Pd 催化剂在烯烃与芳香胺的反马尔可夫尼科夫氢氨基羰基化反应中的活性、区域选择性和稳定性,以合成合成线性酰胺。由于L1在空间体积、从三齿膦到双齿膦的转换配位模式以及对水分和氧气的稳健性方面的独特特性, L1赋予Pd催化剂高活性、良好的区域选择性和优异的性能这种羰基化的稳定性,导致目标酰胺的产率为 44 ∼ 87%,L/B 大于 80/20。就地_高压FT-IR分析和DFT计算证实L1不仅促进了Pd II -H活性物质(ν ca. 1932 cm -1 )的形成和稳定性,而且促进了反马尔可夫尼科夫烯烃与Pd II的加成-H 键由于线性中间体 ( B-1 )的有利能级。此外,由于L1可以作为双齿螯合剂与Pd(II)中心配位作为完成催化,然后作为三足钳与Pd(0)中心配