Substrate-Controlled Transformation of Azobenzenes to Indazoles and Indoles via Rh(III)-Catalysis
作者:Shangjun Cai、Songyun Lin、Xiangli Yi、Chanjuan Xi
DOI:10.1021/acs.joc.6b02548
日期:2017.1.6
excellent regio-selectivity are achieved in this reaction. Mechanistically, the reaction with acrylates undergoes β-hydride elimination, while the reaction with vinyl ketones or acrylamides undergoes nucleophilicaddition. Copper acetate was supposed to play different roles in the β-hydride elimination to furnish indazoles and nucleophilicaddition of C–Rh bond to deliver 2-acyl (NH) indoles.
Batting the ylides: A simple procedure carried out under mild conditions allows the direct and efficientsynthesis of structurally diverse indoles. This approach involves a cascadereaction of sulfurylides and N‐(ortho‐chloromethyl)arylamides (see scheme).
A Practical Synthesis of 2-Aroylindoles from N-(2-Formylphenyl)trifluoroacetamides in PEG-400
作者:Jiancun Zhang、Yu Zhao、Deyao Li、Liwen Zhao
DOI:10.1055/s-0030-1258445
日期:2011.3
to the synthesis of highly functionalized 3-unsubstituted 2-aroylindoles is described. Moderate to good yields were obtained through the reaction of easily accessible N-(2-formylphenyl)trifluoroacetamides and α-bromoacetophenones in the presence of K2CO3. PEG-400 was found to be an efficient and reusable solvent in the process. 2-aroylindoles - PEG-400 - N-(2-formylphenyl)trifluoroacetamides - heterocycles
描述了一种一锅法且对环境无害的方法,用于合成高度官能化的3-未取代的2-芳酰基吲哚。在K 2 CO 3存在下,通过容易获得的N-(2-甲酰基苯基)三氟乙酰胺与α-溴乙酰苯的反应,可得到中等至良好的收率。发现PEG-400是该过程中有效且可重复使用的溶剂。 2-芳基吲哚-PEG-400- N-(2-甲酰基苯基)三氟乙酰胺-杂环-环化
Catalytic Asymmetric Allylic Substitution/Isomerization with Central Chirality Transposition
作者:Zhengyu Han、Han Zhuang、Luning Tang、Yu Zang、Wengang Guo、Hai Huang、Jianwei Sun
DOI:10.1021/acs.orglett.2c01559
日期:2022.6.17
asymmetric allylic substitution/isomerization process with central chirality transposition. This process takes advantage of the ambident reactivity of the 2-indole imine methide generated in situ from racemic tertiary indolylmethanols. The use of a suitable chiralphosphoricacid catalyst and an ortho-directing group allowed regioselective formation a C–C bond at the 3 position but enantiocontrolled construction
Carbazoquinocin Analogues as Small Molecule Biomimetic Organocatalysts in Dehydrogenative Coupling of Amines
作者:Samrat Kundu、Chayan Ghosh、Abhisek Metya、Ankush Banerjee、Modhu Sudan Maji
DOI:10.1021/acs.orglett.4c00229
日期:2024.3.1
biomimetic ortho-quinone catalysts structurally resembling carbazoquinocin alkaloids have been introduced to promote tunable, metal cocatalyst-free, organocatalytic, dehydrogenative amineoxidationunderaerobicconditions. Differently substituted benzyl amines were tolerated under optimized conditions to provide imines in excellent yields. Further efficacy of the catalyst was demonstrated by synthesizing