Boron trifluoride–etherate in fluorinated alcohols: A powerful promoter system for intramolecular alkyne–aldehyde metathesis of o-(3-arylpropargyloxy)benzaldehydes
摘要:
Boron trifluoride-etherate (BF3 center dot OEt2) in 2,2,2-trifluoroethanol (TFE) was found to be a highly efficient promoter system for the intramolecular alkyne-aldehyde metathesis of o-(3-arylpropargyloxy)benzaldehydes. The reaction produces the corresponding 3-aroyl-2H-chromenes in excellent yields under metal free conditions. (C) 2018 Elsevier Ltd. All rights reserved.
condensation/intramolecular heteroDiels–Alderreaction using O-(arylpropynyloxy)-salicylaldehydes in the presence of ethylenediamine diacetate (EDDA) is reported. This organocatalyzed protocol is compatible toward a wide range of aryl-substituted alkynyl ethers with electron-donating and electron-withdrawing groups. When other active methylene compounds were subjected to this domino reaction the corresponding
Diversity-Oriented Synthesis of Benzo[<i>f</i>][1,4]oxazepine-, 2<i>H</i>-Chromene-, and 1,2-Dihydroquinoline-Fused Polycyclic Nitrogen Heterocycles under Microwave-Assisted Conditions
作者:Diksha Rajput、Dolma Tsering、Muthu Karuppasamy、Kamal K. Kapoor、Subbiah Nagarajan、C. Uma Maheswari、Nattamai Bhuvanesh、Vellaisamy Sridharan
DOI:10.1021/acs.joc.3c00552
日期:2023.7.7
An efficient, diversity-oriented synthesis of oxazepino[5,4-b]quinazolin-9-ones, 6H-chromeno[4,3-b]quinolines, and dibenzo[b,h][1,6]naphthyridines was established involving a substrate-based approach undermicrowave-assisted and conventional heating conditions in high yields (up to 88%). The CuBr2-catalyzed, chemoselective cascade annulation of O-propargylated 2-hydroxybenzaldehydes and 2-aminobenzamides
建立了氧氮杂[5,4- b ]喹唑啉-9-酮、6 H-色并[4,3- b ]喹啉和二苯并[ b , h ][1,6]萘啶的高效、多样性合成涉及在微波辅助和传统加热条件下基于基材的方法,产率高(高达 88%)。CuBr 2催化的O-炔丙基化 2-羟基苯甲醛和 2-氨基苯甲酰胺的化学选择性级联成环作用传递了 oxazepino[5,4- b ]quinazolin-9-ones,涉及 6- exo - trig环化-空气氧化-1,3-质子位移-7- exo-dig环化序列。这种一锅法表现出优异的原子经济性(−H 2 O),并在一次合成操作中构建了两个新的杂环(六元和七元)和三个新的C-N键。另一方面,O / N-炔丙基化2-羟基/氨基苯甲醛和2-氨基苯甲醇之间的反应产生6 H-色并[4,3- b ]喹啉和二苯并[ b,h][1,6]萘啶涉及顺序亚胺形成-[4 + 2]杂-狄尔斯-阿尔德反应
Rapid Assembly of Functionalized 2<i>H</i>-Chromenes and 1,2-Dihydroquinolines via Microwave-Assisted Secondary Amine-Catalyzed Cascade Annulation of 2-<i>O</i>/<i>N</i>-Propargylarylaldehydes with 2,6-Dialkylphenols
作者:Diksha Rajput、Gowsia Jan、Muthu Karuppasamy、Nattamai Bhuvanesh、Subbiah Nagarajan、C. Uma Maheswari、J. Carlos Menéndez、Vellaisamy Sridharan
DOI:10.1021/acs.joc.3c01082
日期:2023.8.18
in which the reactions were completed in just 15 min, and the yields obtained were up to 95%. This highly atom-economical domino process constructed two new C–C double bonds and a six-membered O/N-heterocyclic ring in a single synthetic operation. Its mechanism process was rationalized as involving sequential iminium ion formation, nucleophilic addition, and intramolecular annulation steps. Furthermore
建立了2- O / N-炔丙基芳醛与 2,6-二烷基酚的有效仲胺催化级联环化,以获取与合成有用的对醌甲基化物支架连接的生物学相关的官能化2H-色烯和 1,2-二氢喹啉在微波辐射和常规加热条件下具有高产率。微波辅助策略方便、清洁、快速、产率高,反应仅需15 min即可完成,收率高达95%。这种高度原子经济的多米诺骨牌工艺在一次合成操作中构建了两个新的C-C双键和一个六元O/N-杂环。其机理过程被合理化为涉及连续的亚胺离子形成、亲核加成和分子内成环步骤。此外,合成的2H-色烯衍生物通过钯-催化剂转化为有价值的茚并[2,1- c ]色烯、5H-茚并[2,1- c ]喹啉和氧化烯并[2,3- c ]色烯。分别催化双C-H键活化过程和环氧化过程。
Lewis-Acid-Catalyzed Decarboxylative Annulation of 2-Aminoindole-3-Carboxylate with Ynals Involving [3 + 2] Spirocycloaddition and 2,3-Aza Migration
2-Aminoindole-3-carboxylates undergo a Lewis-acid-catalyzed decarboxylative annulation with ynals to afford dihydro-chromeno-fused delta-carbolines through a 2,3-aza migration, via a spirocyclic intermediate generated from an initial [3 + 2] spirocycloaddition. Bronsted acid interference changes the path from a [3 + 2] to a [4 + 2] addition. 2-Aminoindoles without an ester functional group at C3 underwent a different condensation, followed by hetero-Diels Alder reaction to generate chromeno-fused alpha-carbolines.
Discovery of Novel Aminobutanoic Acid-Based ASCT2 Inhibitors for the Treatment of Non-Small-Cell Lung Cancer