Nouvelle méthode de préparation d'éthers vinyliques à partir d'acétals
作者:Francis Barbot、Philippe Miginiac
DOI:10.1002/hlca.19790620509
日期:1979.7.17
A new way to vinylic ethers from acetals
缩醛制乙烯醚的新方法
Metal-Free Oxidative Decarbonylative [3+2] Annulation of Terminal Alkynes with Tertiary Alkyl Aldehydes toward Cyclopentenes
作者:Hua-Xu Zou、Yang Li、Xu-Heng Yang、Jiannan Xiang、Jin-Heng Li
DOI:10.1021/acs.joc.8b01130
日期:2018.8.3
A new metal-free oxidative decarbonylative [3+2] annulation of terminal alkynes with tertiary alkylaldehydes is presented, which features broad substrate scope and excellent selectivity. The selectivity of this reaction toward cyclopentenes and indenes relies on the nature of the aldehyde substrates. While treatment of tertiary γ,δ-unsaturated aldehydes with common terminal alkynes assembles cyclopentenes
Sequential Hydrozirconation/Cyclization of Dienes, a New Route toward <i>Trans</i> 2-Substituted Vinylcyclopentanes
作者:Sébastien Clergue、Jean-Luc Vasse
DOI:10.1021/ol500400s
日期:2014.3.7
The diastereoselective synthesis of trans-2-substituted vinylcyclopentanes is described. The method is based on the intramolecular coupling of 7-methoxy-1,5-dienes involving a sequential activation of the C═C double bonds via hydrozirconation and TMSOTf-promoted allylation.
Decarbonylative Formation of Homoallyl Radical Capable of Annulation with <i>N</i>-Arylpropiolamides via Aldehyde Auto-oxidation
作者:Yang Li、Jin-Heng Li
DOI:10.1021/acs.orglett.8b02243
日期:2018.9.7
A new metal-free aldehyde auto-oxidation strategy that allows the decarbonylative formation of homoallyl radical capable of cascade annulations with alkynes is described. By using various N-arylpropiolamides, the oxidative radical [3 + 2]/[5 + 2] cascade annulation reaction was achieved to produce benzo[b]cyclopenta[e]azepin-4(1H)-ones, which represent a powerful new platform for the intermolecular
描述了一种新的无金属的醛自氧化策略,该策略允许脱羰基形成能够与炔烃级联成环的均烯丙基自由基。通过使用各种N-芳基丙酰胺,氧化自由基[3 + 2] / [5 + 2]级联环化反应生成苯并[ b ]环戊[ e ] azepin-4(1 H)-one,代表了用于炔烃分子间环加成的新平台,具有广泛的底物范围和高选择性。
Palladium-Catalyzed Trans-Selective Synthesis of Spirocyclic Cyclobutanes Using α,α-Dialkylcrotyl- and Allylhydrazones
作者:Isaiah K. Eckart-Frank、Sidney M. Wilkerson-Hill
DOI:10.1021/jacs.3c05699
日期:2023.8.23
vinylcyclobutanes in a diastereoselective fashion. We show 24 examples of a 1,1-insertion/4-exo-trig tandem process to produce these motifs. Additionally, spirocyclic alkylidene cyclobutanes can be obtained by using α,α-disubstituted allylated hydrazones (11 examples). In this study, we show that the aryl migrating group has a dramatic impact on the course of the reaction. Specifically, allylic C–H insertion