ethinyloges 1‐Benzyl‐1,2‐dihydroisochinolin sollte 7 mit verdünnter Säure die Dihydroisochinolinumlagerung erleiden. Mit verdünnter HCl entstand aus 7 ein Gemisch von Umlagerungsprodukten, das nicht getrennt werden konnte. Die Ergebnisse von spektroskopischen Untersuchungen sprechen dafür, daß 7 die erwartete Dihydroisochinolinumlagerung erfahren hat.
The silver(I)-promoted oxidative cyclisation of 1-propargyl-substituted tetrahydroisoquinolines affords pyrrolo[2,1-a]isoquinolines. Scope and limitations of this method are described and an application to the synthesis of the natural product (±)-crispine A is presented.
1-炔丙基取代的四氢异喹啉经银(I)促进的氧化环化反应可得到吡咯并[2,1- a ]异喹啉。描述了该方法的范围和局限性,并提出了在天然产物(±)-crispine A合成中的应用。
Enantioselective Synthesis of 4-Hydroxy-2-cyclohexenones through a Multicomponent Cyclization
作者:José Barluenga、Marcos G. Suero、Raquel De la Campa、Josefa Flórez
DOI:10.1002/anie.201004413
日期:2010.12.10
and a propargylic organomagnesium reagent giving access to novel and densely functionalized 4‐allenyl‐2‐cyclohexenones (see scheme). These useful synthetic intermediates have been prepared through a cyclization process that involves newly reported reaction steps and an unusually high level of asymmetric induction.
tert‐butanesulfinyl imines, and subsequent Pauson‐Khand reaction of resulting enyne derivatives, carried out both stoichiometrically and catalytically. The Pauson‐Khand reaction tolerated both substituted alkenes and alkynes, and took place in good yields and diastereoselectivities, even when applied to a gram‐scale synthesis.
Gold‐Catalyzed Cyclizations and [3+2]‐Annulation Cascades between 1,5‐Diyn‐3‐ols and Nitrones to Construct Carbazole Frameworks
作者:Sudhakar Dattatray Tanpure、Manoj Dilip Dhole、Rai‐Shung Liu
DOI:10.1002/adsc.202300711
日期:2023.9.5
Gold-catalyzedcascade reactions between 1,5-diyn-3-ols and nitrones to deliver carbazole derivatives are described. Such cascade reactions are applicable to facile synthesis of polyaromatic compounds containing carbazole subunits. Notably, the reaction mechanism involves unexpected oxoarylations, rather than oxidative Mannich reactions as known for but-1-yn-4-ols. Our control experiments indicate