Rh2(II)-Catalyzed Nitro-Group Migration Reactions: Selective Synthesis of 3-Nitroindoles from β-Nitro Styryl Azides
摘要:
Rhodium carboxylate complexes (1 mol %) catalyze the migration of electron-withdrawing groups to selectively produce 3-substituted indoles from beta-substituted styryl azides. The relative order of migratorial aptitude for this transformation is ester << amide < H < sulfonyl < benzoyl << nitro.
Rhodium-Catalyzed Synthesis of 2,3-Disubstituted Indoles from β,β-Disubstituted Stryryl Azides
作者:Ke Sun、Sheng Liu、Patryk M. Bec、Tom G. Driver
DOI:10.1002/anie.201006917
日期:2011.2.11
Rings à la carte: Rhodium carboxylate complexes catalyze selective cascade reactions to produce a range 2,3‐disubstituted indolesfromβ,β‐disubstituted stryrylazides. The selective migration of aryl groups appears to originate from a putative phenonium ion reactive intermediate (see scheme).
indium-mediated cascade annulation reaction of 2-azidoaryl aldehydes with propargyl bromides is reported. The aromatic 5/6/6-fused heterocycles, [1,2,3]triazolo[1,5-a]quinoline derivatives, could be constructed in one pot in moderate yields with a broad substrate scope. Mechanistic studies indicated that the reaction proceeded through allenol formation, azide–allene [3 + 2] cycloaddition, and dehydration
报道了一种有效的铟介导的 2-叠氮芳基醛与炔丙基溴的级联环化反应。芳香族 5/6/6-稠合杂环,[1,2,3]三唑并[1,5- a ]喹啉衍生物,可以在一锅中以中等产率和广泛的底物范围构建。机理研究表明,该反应通过丙二烯醇形成、叠氮-丙二烯[3 + 2]环加成和脱水进行。还探索了产品的合成潜力,包括脱氮功能化和 Pd 催化的偶联反应。
Merging Gold Catalysis and Brønsted Acid Catalysis for the Synthesis of Tetrahydrobenzo[<i>b</i>][1,8]naphthyridines
作者:Ruxia Yi、Xincheng Li、Boshun Wan
DOI:10.1002/adsc.201701323
日期:2018.3.1
A gold(I)/Brønsted acid‐catalyzed cyclization of 2‐azidobenzaldehydes with 3‐aza‐1,6‐enynes has been developed for the synthesis of tetrahydrobenzo[b][1,8]naphthyridine derivatives. This protocol enabled the modular synthesis of tetracyclic heterocycles in one operation with water and nitrogen gas as the byproducts.
已经开发了金(I)/布朗斯台德酸催化的3-叠氮基-1,6-炔烃对2-叠氮基苯甲醛的环化反应,以合成四氢苯并[ b ] [1,8]萘啶衍生物。该方案能够在一次操作中以水和氮气为副产物,以模块化方式合成四环杂环。
Facile One-Pot Assembly of Imidazotriazolobenzodiazepines via Indium(III)-Catalyzed Multicomponent Reactions
作者:Huy H. Nguyen、Teresa A. Palazzo、Mark J. Kurth
DOI:10.1021/ol402045h
日期:2013.9.6
An operationally simple, one-pot multicomponent reaction has been developed for the assembly of 9H-benzo[f]imidazo[1,2-d][1,2,3]triazolo[1,5-a][1,4]diazepines adorned with three diversification points via an atom-economical transformation incorporating alpha-diketones, o-azidobenzaldehydes, propargylic amines, and ammonium acetate. This process involves tandem InCI3-catalyzed cyclocondensation and intramolecular azide-alkyne 1,3-dipolar cycloaddition reactions; optimization data, substrate scope, and mechanistic insights are discussed.