A Concomitant Allylic Azide Rearrangement/Intramolecular Azide–Alkyne Cycloaddition Sequence
作者:Rakesh H. Vekariya、Ruzhang Liu、Jeffrey Aubé
DOI:10.1021/ol500011f
日期:2014.4.4
An intramolecular Huisgen cycloaddition of an interconverting set of isomeric allylicazides with alkynes affords substituted triazoles in high yield. The stereoisomeric vinyl-substituted triazoloxazines formed depend on the rate of cycloaddition of the different allylicazide precursors when the reaction is carried out under thermal conditions. In contrast, dimerized macrocyclic products were obtained
A Mild Anionic Method for Generating <i>o-</i>Quinone Methides: Facile Preparations of <i>Ortho</i>-Functionalized Phenols
作者:Ryan M. Jones、Ryan W. Van De Water、Christopher C. Lindsey、Christophe Hoarau、Thay Ung、Thomas R. R. Pettus
DOI:10.1021/jo001752e
日期:2001.5.1
A low-temperature method for generating o-quinone methides is described which permits facile introduction of assorted R substituents onto the aryl ring system at low temperature. The method is useful for the efficient preparation of ortho-ring-alkylated phenols.
dihydrobenzofurans via an organocatalytic oxidation of o-allylphenols is presented. The use of 2,2,2-trifluoroacetophenone and H2O2 as the oxidation system, leads to a highly useful synthetic method, where a variety of substituted o-allylphenols were cyclized in high yields. A green and cheap protocol for the synthesis of dihydrobenzofurans via an organocatalytic oxidation of o-allylphenols is presented. The use of
作为专题“现代合成中的环化策略”的一部分发布 抽象的 提出了一种绿色廉价的方案,用于通过邻烯丙基苯酚的有机催化氧化合成二氢苯并呋喃。使用2,2,2-三氟苯乙酮和H 2 O 2作为氧化系统,导致了一种非常有用的合成方法,其中各种取代的邻烯丙基苯酚均以高收率环化。 提出了一种绿色廉价的方案,用于通过邻烯丙基苯酚的有机催化氧化合成二氢苯并呋喃。使用2,2,2-三氟苯乙酮和H 2 O 2作为氧化系统,导致了一种非常有用的合成方法,其中各种取代的邻烯丙基苯酚均以高收率环化。
Clay catalyzed rearrangement of substituted allyl phenyl ethers: Synthesis of ortho-allyl phenols, chromans and coumarans
作者:William G. Dauben、Jeffrey M. Cogen、Victor Behar
DOI:10.1016/s0040-4039(00)89033-4
日期:1990.1
Montmorillonite clays catalyze the rearrangement of substituted allyl phenyl ethers to provide ortho-allyl phenols, chromans and coumarans under mild conditions.
Tandem Claisen Rearrangement/6-<i>endo</i>Cyclization Approach to Allylated and Prenylated Chromones
作者:Bernd Schmidt、Martin Riemer、Uwe Schilde
DOI:10.1002/ejoc.201501151
日期:2015.12
o-acylphenols reacted upon microwave irradiation to form C-allylated or -prenylated chromone derivatives, depending on the substitution pattern of the arene and the allyl substituent. The reaction proceeds through a tandemClaisen rearrangement and 6-endo-trig or 6-endo-dig cyclization sequence. For prenyl ethers, the tandem sequence can be extended by a Cope rearrangement to furnish 6-prenylchromones.