Organocatalytic [10+4] cycloadditions for the synthesis of functionalised benzo[<i>a</i>]azulenes
作者:Maxime Giardinetti、Nicolaj Inunnguaq Jessen、Mette Louise Christensen、Karl Anker Jørgensen
DOI:10.1039/c8cc08551j
日期:——
A direct and mild strategy for the synthesis of benzo[a]azulenes based on an organocatalytic [10+4] cycloaddition reaction is described. The strategy enables a diversity-oriented approach for the synthesis of various poly-functionalised azulenes from easily accessible starting materials.
描述了基于有机催化的[10 + 4]环加成反应合成苯并[ a ] azulenes的直接和温和的策略。该策略为从易于获得的起始原料合成各种多官能化的天青石提供了一种面向多样性的方法。
Rh(iii)-catalyzed dehydrogenative alkylation of (hetero)arenes with allylic alcohols, allowing aldol condensation to indenes
Efficient Rh(III)-catalyzed C-H activation of different classes of (hetero)arenes such as 2-phenylpyridine, indoles, aryl ketones and acetanilide and their dehydrogenative cross-coupling with allylic alcohols are described. Several important skeletons such as beta-aryl aldehydes and ketones, 2-acetylindenes, 3,4-dihydro-1H-quinolin-2-one and quinoline could be produced using this protocol.
作者:Bjarke S. Donslund、Nicolaj Inunnguaq Jessen、Giulio Bertuzzi、Maxime Giardinetti、Teresa A. Palazzo、Mette Louise Christensen、Karl Anker Jørgensen
DOI:10.1002/anie.201807830
日期:2018.10
[10+4] cycloaddition between catalytically generated amino isobenzofulvenes and electron‐deficient dienes is described. The highly stereoselective catalytic [10+4] cycloaddition exhibits a broad scope with high yields, reflecting a robust higher‐order cycloaddition. Experimental and computational investigations support a kinetic distribution of intermediate rotamers dictating the enantioselectivity, which relies
Aminocatalytic Alkylation of Indene‐2‐Carbaldehydes
<i>via</i>
Pentaenamine Activation
作者:Artur Przydacz、Aleksandra Topolska、Anna Skrzyńska、Sebastian Frankowski、Łukasz Albrecht
DOI:10.1002/adsc.202101296
日期:2022.3
undergoing 1,6-addition is described. As a result an alkylation of the indene ring of the starting indene-2-carbaldehydes with para-quinone methides is achieved. Stereoselectivity of the process is controlled by C2-symmetric 2,5-diphenylpyrrolidine. The developed process exploits the reactivity of amino isobenzofulvene intermediates derivedfrom indene-2-carbaldehydes in a non-cycloadditive manner
Lewis Acid-Mediated Friedel–Crafts-Type Formylation of Alkenes with Dichloromethyl Methyl Ether in the Presence of Pyridines
作者:Shinya Tanaka、Yuji Yoshii、Tetsutaro Hattori
DOI:10.1021/acs.joc.3c02059
日期:2024.3.1
methyl ether (MOMCl2) by the combined use of SnCl4/2,6-dibromopyridine (B1) or AgOTf/pyridine (B4) via Friedel–Crafts-type reaction. The former reagent combination is mainly applied to α,α-diarylalkenes, while the latter one is applied not only to arylalkenes but also to some alkylalkenes. Vinyl aldehydes are exclusively obtained from alkenes that can possibly afford both allyl and vinyl aldehydes.