Synthesis of (Z)-1,2-dihydro-1-tosylbenzo[b]azepin-3-ones by two-step, one-pot gold-catalyzed tandem heterocyclization/Petasis–Ferrier rearrangement of 2-(N-(prop-2-ynyl)-N-tosylamino)benzaldehydes
摘要:
A two-step, one-pot synthetic method that relies on gold(I)-catalyzed tandem heterocyclization/Petasis-Ferrier rearrangement and Bronsted acid-assisted debenzoxylation of 2-(N-(prop-2-ynyl)-N-tosylamino)benzaldehydes to prepare (2)-1,2-dihydro-1-tosylbenzo[b]azepin-3-ones efficiently is reported. The reactions proceed rapidly under mild and operationally straightforward conditions for a wide variety of aldehyde substrates containing electron-withdrawing, electron-donating, and sterically demanding functional groups and afforded the corresponding benzo-fused azaheterocyclic products in moderate to excellent yields. (C) 2013 Elsevier Ltd. All rights reserved.
Iridium-Catalyzed <i>ortho</i>-C(sp<sup>2</sup>)–H Amidation of Benzaldehydes with Organic Azides
作者:Delong Mu、Xinmou Wang、Gong Chen、Gang He
DOI:10.1021/acs.joc.7b00531
日期:2017.4.21
ortho-C(sp2)–H amidation reaction of benzaldehydes with organic azides has been developed. A catalytic amount of 3,5-di(trifluoromethyl)aniline was used to promote the Ir-catalyzed directed C–H amination reaction through a transient aldimine intermediate. This reaction tolerates a broad scope of benzaldehyde substrates and works well with a range of aryl- and alkylsulfonyl azides.
Copper-Catalyzed (4+1) Cascade Annulation of Terminal Alkynes with 2-(Tosylmethyl)anilines: Synthesis of 2,3-Disubstituted Indoles
作者:Xu Yan、Chun-Fang Liu、Xian-Tao An、Xiao-Min Ge、Qing Zhang、Lin-Han Pang、Xu Bao、Chun-An Fan
DOI:10.1021/acs.orglett.1c03402
日期:2021.11.19
alkynes as one-carbon synthons with 2-(tosylmethyl)anilines has been developed for the expeditious synthesis of 2,3-disubstituted indoles, in which in situ generations of aza-o-quinone methides and alkynyl-copper(I) species are involved. This annulation provides an effective method for the assembly of synthetically and structurally interesting 2,3-disubstituted indoles.
已经开发了一种基于 Cu 催化 (4+1) 级联环化末端炔作为单碳合成子与 2-(甲苯磺酰甲基)苯胺的新策略,用于快速合成 2,3-二取代吲哚,其中原位生成的氮杂Ó -quinone甲基化物和炔基-铜(I)类的参与。这种环化为合成和结构上有趣的 2,3-二取代吲哚的组装提供了一种有效的方法。
Direct stereoselective construction of cyclopropane α-amino acid with contiguous quaternary centers via [4 + 2] annulation reaction
A direct diastereoselective synthetic approach to useful cyclopropane α-amino acid was established via base-promoted [4 + 2] annulations between o-aminobenzaldehydes and alkyl 2-aroyl-1-chlorocyclopropanecarboxylates. The annulation reaction proceeded quickly under mildly basic conditions, affording α-aminocyclopropanecarboxylic acid derivatives in moderate to excellent yields with high diastereoselectivities
Ruthenium-Catalyzed Ortho C(sp2)–H Amidation of Benzaldehydes with Organic Azides
作者:Omer Rasheed
DOI:10.1055/s-0036-1591765
日期:2018.5
Abstract A ruthenium-catalyzed functionalization of benzaldehyde substrate with organic azides promoted by various transient directing groups has been developed. In this approach, C–H amination is achieved via a transient aldimine intermediate in good to excellent yields. A ruthenium-catalyzed functionalization of benzaldehyde substrate with organic azides promoted by various transient directing groups
Synthesis of 1,2-Dihydroquinolines via Hydrazine-Catalyzed Ring-Closing Carbonyl-Olefin Metathesis
作者:Yunfei Zhang、Jae Hun Sim、Samantha N. MacMillan、Tristan H. Lambert
DOI:10.1021/acs.orglett.0c02116
日期:2020.8.7
The synthesis of 1,2-dihydroquinolines by the hydrazine-catalyzed ring-closing carbonyl-olefin metathesis (RCCOM) of N-prenylated 2-aminobenzaldehydes is reported. Substrates with a variety of substitution patterns are shown. With an acid-labile protecting group on the nitrogen atom, in situ deprotection and autoxidation furnish quinoline. In comparison with related oxygen-containing substrates, the