Acid-catalyzed cleavage of C–C bonds enables atropaldehyde acetals as masked C2 electrophiles for organic synthesis
作者:Shaomin Chen、Minghao Li、Yanlong Gu
DOI:10.1039/d1cc04000f
日期:——
Acid-catalyzed tandem reactions of atropaldehyde acetals were established for the synthesis of three important molecules, 2,2-disubstituted indolin-3-ones, naphthofurans and stilbenes. The synthesis was realized using novel reaction cascades, which involved the same two initial steps: (i) SN2′ substitution, in which the atropaldehyde acted as an electrophile; and (ii) oxidative cleavage of the carbon–carbon
阿托醛缩醛的酸催化串联反应被建立用于合成三个重要分子,2,2-二取代 indolin-3-ones、萘并呋喃和芪。该合成是使用新的反应级联反应实现的,其中涉及相同的两个初始步骤:(i) S N 2' 取代,其中阿托醛充当亲电子试剂;(ii) 生成的苯乙醛类产物的碳-碳键的氧化裂解。与文献方法相比,本协议不仅避免使用昂贵的贵金属催化剂,而且操作简单。
Ionic liquids accelerating cycloaddition between 1-aryl-2-halocyclopropenes and furan
作者:May-Fan Ding、Shaw-Tao Lin、Woan-Ju Chang
DOI:10.3998/ark.5550190.0011.219
日期:——
with furan in a RTIL to give a fair good yield of the [4+2]-cycloadducts with more than 90% of the exo-isomer. The imidazolium type ionicliquids are able to accelerate this cycloaddition process with high steric selectivity. Neither pyrrole nor thiophene undergoes the cycloaddition with cyclopropene to form the [4+2]-cycloadduct. 1-Aryl-3,3-difluoro-2-halocyclopropenes are inert towards furan even
Spectroscopic Analysis of the Products of the Cycloaddition Reaction of 1-Aryl-2-chlorocyclopropenes and Cyclopentadiene
作者:Mei-Fang Ding、Chuan-Chen Lee、Lian-Chun Lin、Shaw-Tao Lin
DOI:10.1002/jccs.201300216
日期:2014.2
t‐BuOK at −10 °C produces the corresponding 1‐aryl‐2‐halocyclopropenes, which react with cyclopentadiene to produce fairly good yield of [4+2]‐cycloadditionproducts with more than 90% of the endo‐isomer. The higher yield obtained from hexane medium then from methanol and ionic liquid demonstrates that the reaction is a nonpolar process.