N-甲基化或非甲基化3,4-二氢环戊[ b ]吲哚-1(2 H)-ones(3)和1,2,3,9-四氢咔唑-4(4 H)-one(10)的有效合成途径基于Pd催化的分子内Heck反应进行了详细的描述。在双官能底物12和三官能底物17的情况下,分别研究了环化的化学选择性。在后一种情况下,取决于催化剂,分别通过单Heck反应和双Heck反应获得溴化的吲哚18或四环化合物19。
Exploiting the radical reactivity of diazaphosphinanes in hydrodehalogenations and cascade cyclizations
作者:Jingjing Zhang、Jin-Dong Yang、Jin-Pei Cheng
DOI:10.1039/d0sc01352h
日期:——
Here we exploited their unprecedentedradical reactivity to implement hydrodehalogenations and cascadecyclizations originally inaccessible by hydride transfer. These reactions feature a broad substrate scope, high efficiency and simplicity of manipulation. Mechanistic studies suggested a radical chain process in which a phosphinyl radical is generated in a catalytic cycle via hydrogen-atom transfer
Monobenzofused 1,4-Azaborines: Synthesis, Characterization, and Discovery of a Unique Coordination Mode
作者:Senmiao Xu、Fredrik Haeffner、Bo Li、Lev N. Zakharov、Shih-Yuan Liu
DOI:10.1002/anie.201403903
日期:2014.6.23
analysis of the Pt complexes shows a strong structural contribution from the iminium resonance form of the monobenzofused‐1,4‐azaborine ligand. We also demonstrate that a palladium(0) complex supported by a 1,4‐azaborine‐based phosphine ligand can catalyze hydroboration of 1‐buten‐3‐yne with unique selectivity. In view of the importance of arene–metal π‐interactions in catalyticapplications, this work should
Enhancing catalytic activity towards Heck-reaction by using 4,5,9,10-tetra(arylimino)pyrenylidenyldipalladium tetrachlorides
作者:Tong Zhao、Qifeng Xing、Kuifeng Song、Qing Ban、Tongling Liang、Qingbin Liu、Wen-Hua Sun
DOI:10.1039/c4ra16193a
日期:——
A series of binuclear 4,5,9,10-tetra(arylimino)pyrenylidenyldipalladium(ii) tetrachloride complexes (Pd1–Pd4) was synthesized and characterized by FT-IR and NMR spectroscopy as well as elemental analysis.
Insertion Reaction of 2-Halo-N-allylanilines with K2S Involving Trisulfur Radical Anion: Synthesis of Benzothiazole Derivatives under Transition-Metal-Free Conditions
benzothiazole derivatives through the reaction of 2-halo-N-allylanilines with K2S in DMF is developed. The trisulfur radical anion S3·–, which is generated in situ from K2S in DMF, initiates the reaction without transition-metal catalysis or other additives. In addition, two C–S bonds are formed and heteroaromatization of benzothiazole is triggered by radical cyclization and H-shift.