The Divergent Cascade Reactions of Arylalkynols with Homopropargylic Amines or Electron-Deficient Olefins: Access to the Spiro-Isobenzofuran-<i>b</i>-pyrroloquinolines or Bridged-Isobenzofuran Polycycles
作者:Lun Wang、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1021/acs.joc.8b00691
日期:2018.8.3
Two divergent cascade reactions of arylalkynols with homopropargylic amines or electron-deficient olefins were developed to synthesize the spiro-isobenzofuran-b-pyrroloquinolines or bridged-isobenzofuran heterocycles in good yields, respectively. One reaction actually involved intramolecular 5-endo-dig hydroamination cyclization–protonation of homopropargylic amines to give cycloiminium ions and intramolecular
Copper-Catalyzed Cascade Reaction via Intramolecular Hydroamination Cyclization of Homopropargylic Amines and Intermolecular Povarov Reaction with Imines
作者:Hongkai Wang、Chan Wang、Kaimeng Huang、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1021/acs.orglett.6b00804
日期:2016.5.20
cascade reaction of homopropargylic amines with simple imines is developed in the presence of Cu(OTf)2 and affords a series of hexahydro-1H-pyrrolo[3,2-c]quinoline derivatives in good to high yields. This reaction proceeds through an intramolecular hydroamination cyclization of homopropargylic amine to generate a highly reactive dihydropyrrole intermediate in situ. It subsequently reacts with imine via
在Cu(OTf)2存在下,开发了一种新的单炔胺与单亚丙基胺的级联反应,该反应可提供高产率或高产率的一系列六氢-1 H-吡咯并[3,2- c ]喹啉衍生物。该反应通过均炔丙基胺的分子内加氢胺化环化进行,以原位产生高反应性的二氢吡咯中间体。随后,它通过分子间反电子需求的aza-Diels-Alder反应和1,3-H移位与亚胺反应,形成稠合的吡咯并喹啉结构,形成两个新的C-C键,一个C-N键和一个N –H键。
Silver-Catalyzed Three-Component 1,1-Aminoacylation of Homopropargylamines: α-Additions for Both Terminal Alkynes and Isocyanides
The reaction of secondary homopropargylamines, isocyanides, and water in the presence of a catalytic amount of silver acetate and subsequent purification by chromatography on silica gel afforded substituted proline amides in good to excellent yields. Primary homopropargylamines underwent a cyclizative Ugi–Joullié three-component reaction with isocyanides and carboxylic acids to afford functionalized
Povarov Reaction of Cycloiminium Formed in Situ via Hydroamination Cycloisomerization of Homopropargylic Amines with Electron-Rich Olefins
作者:Qiangqiang Liu、Chan Wang、Qiang Li、Yajie Hou、Ye Wu、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1021/acs.joc.6b02496
日期:2017.1.20
A new, one-pot cascade reaction of homopropargylic amines with electron-rich olefins is developed in the presence of Cu(OTf)2 and affords a series of octahydrofuro[3,2-c]pyrrolo[1,2-a]quinoline derivatives in yields of 38–80%. This reaction proceeds through an intramolecular hydroamination cyclization of homopropargylic amine to generate a highly reactive cycloenamine intermediate in situ that subsequently
在Cu(OTf)2存在下开发了一种新的单炔胺与富电子烯烃的级联反应,并提供了一系列八氢呋喃[3,2- c ]吡咯并[1,2- a ]喹啉衍生物收率为38–80%。该反应通过高炔丙基胺的分子内加氢胺化反应进行,以生成高反应性的环烯胺中间体,该中间体随后异构化成环亚胺阳离子,然后与二氢呋喃,二氢吡喃或二氢吡咯进行Povarov型反应。值得注意的是,Al 2 O 3添加剂在有效抑制高炔丙基胺竞争性二聚方面起着关键作用。
The Diverse Reactivity of Homopropargylic Amines as “Masked” 1C Synthons for the Aza-Friedel-Crafts Alkylation of Indoles
作者:Hao Chen、Min Ni、Xiaofeng Bao、Chan Wang、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1002/ejoc.201701523
日期:2018.1.31
A novel type of “masked” 1C synthon was developed through the hydroamination cyclization‐protonation of homopropargylic amines to act as aza‐Friedel–Crafts alkylation reagents to react with indoles. A variety of 3‐(2‐pyrrolidinyl)indoles were generated in good to high yields.