Zinc(ii)-catalyzed intramolecular hydroarylation-redox cross-dehydrogenative coupling ofN-propargylanilines with diverse carbon pronucleophiles: facile access to functionalized tetrahydroquinolines
Facile access to sterically hindered aryl ketones via carbonylative cross-coupling: application to the total synthesis of luteolin
作者:B. Michael O’Keefe、Nicholas Simmons、Stephen F. Martin
DOI:10.1016/j.tet.2011.03.074
日期:2011.6
achieving the carbonylative cross-coupling of sterically hindered, ortho-disubstituted aryl ketones is reported. The commercially available PEPPSI-IPr catalyst is shown to efficiently promote the carbonylative cross-coupling of hindered ortho-disubstituted aryl iodides to give diaryl ketones; traditional phosphine catalysts are less effective. Carbonylative Suzuki-Miyaura cross-couplings provide a diverse array
Nickel-Catalyzed Difunctionalization of Alkynyl Bromides with Thiosulfonates and N-Arylthio Succinimides: A Convenient Synthesis of 1,2-Thiosulfonylethenes and 1,1-Dithioethenes
cesium carbonate is described. An operationally simple and highly regioselective atom transfer radical addition (ATRA) of alkynyl bromides provides a wide range of (E)-1,2-thiosulfonylethenes (α-aryl-β-thioarylvinyl sulfones) in moderate to high yields. The extensive substrate scope of both alkynyl bromides and thiosulfonates is explored with a broad range of functional groups. Indole-derived 1,1-bromoalkenes
Controlled Reactivity of 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) in the Selective Synthesis of 1-(Bromoethynyl)arenes
作者:Shiva Krishna Moodapelly、Gangavaram V. M. Sharma、Venkata Ramana Doddi
DOI:10.1002/adsc.201601279
日期:2017.5.2
1‐(bromoethynyl)arenes from 1,1‐dibromoalkenes. Differential reactivity of DBU in protic solvents as compared to aprotic solvents has been explored to prevent the formation of mixtures of products in this reaction. Hydrated DBU is found to be superior to dry DBU, both for the selective synthesis and ease of isolation. In addition, use of DBU⋅H2O as a non‐nucleophilic mild base allowed us to synthesise 1‐
Rh(I)-Catalyzed Carbene Migration/Carbonylation/Cyclization: Straightforward Construction of Fully Substituted Aryne Precursors
作者:Guohao Zhu、Wen-Chao Gao、Xuefeng Jiang
DOI:10.1021/jacs.0c13012
日期:2021.1.27
The Rh(I)-catalyzed cascade formation of carbenoid followed by a carbonylative cyclization of silyl diynes has been established to achieve diverse ortho silyl-substituted phenolics, enabling access to fully substituted aryne precursors via a one-step fluorosulfurylation. The silyl mask on the termini of alkynes is demonstrated not only to suppress the undesired oxidation but also to control the selectivity
已经建立了 Rh(I) 催化级联形成卡宾,然后甲硅烷基二炔的羰基化环化,以实现多种邻甲硅烷基取代的酚类化合物,从而能够通过一步氟磺酰化获得完全取代的芳炔前体。炔烃末端的甲硅烷基掩膜不仅可以抑制不需要的氧化,还可以控制 CO 插入的选择性。全面建立了对完全取代芳烃的直接访问,并将其应用于多环芳族分子的高效构建。
Copper as a Powerful Catalyst in the Direct Alkynylation of Azoles
作者:François Besselièvre、Sandrine Piguel
DOI:10.1002/anie.200904776
日期:2009.12.7
Copper‐bottomed catalysis! The direct alkynylation of azolesthrough a copper‐based CH bond activation, using alkynylbromides as the coupling partner, has been developed (see scheme). The method is very rapid, is functional‐group tolerant, and provides a straightforward entry to diverse alkynyl heterocycles that is complementary to the Sonogashira reaction.