[3,3]-Sigmatropic Rearrangement/5-<i>exo</i>-<i>dig</i> Cyclization Reactions of Benzyl Alkynyl Ethers: Synthesis of Substituted 2-Indanones and Indenes
作者:Armen A. Tudjarian、Thomas G. Minehan
DOI:10.1021/jo200271s
日期:2011.5.6
Substituted benzyl alkynyl ethers, prepared from the corresponding α-alkoxy ketones in a two-step sequence involving enol triflate formation and KOtBu-induced E2 elimination, undergo [3,3]-sigmatropic rearrangement/intramolecular 5-exo-dig cyclization at 60 °C to form substituted 2-indanones in good overall yields. 1,3-cis-Disubstituted-2-indanones are formed preferentially when the benzylic substituent
取代的苄基的炔醚,从在两步骤序列相应的α -烷氧基酮涉及烯醇三氟甲磺酸形成和KO制备吨卜诱导E2消除,经历[3,3] -sigmatropic重排/分子内-5-外-挖环化在60 °C 以良好的总产率形成取代的 2-茚满酮。当苄基取代基R 1较大时,1,3-顺式-二取代-2-茚满酮优先形成。取代的茚可以通过霍纳-沃兹沃思-埃蒙斯反应以高产率从 2-茚满酮制备。
Gold-Catalyzed Carboalkoxylations of 2-Ethynylbenzyl Ethers to form 1- and 2-Indanones Chemoselectively: Effects of Ligands and Solvents
作者:Chiou-Dong Wang、Yi-Feng Hsieh、Rai-Shung Liu
DOI:10.1002/adsc.201300988
日期:2014.1.13
acidic [tris(pentafluorophenyl)phosphine]gold hexafluoroantimonate [P(C6F5)3AuSbF6] in nitromethane (MeNO2) preferably gives 1‐indanones whereas [(ortho‐biphenyl)di(tert‐butyl)phosphine]gold triflimide [P(tBu)2(o‐biphenyl)AuNTf2] in dichloroethane tends to form 2‐indanone derivatives. For 2‐indanone products, we isolated two indenyl methyl ethers for deuterium labeling analyses, providing evidence for
使用合适的催化剂和溶剂,可以从2-乙炔基苄基醚选择性合成1-和2-茚满酮化合物。硝基甲烷(MeNO 2)中的高酸性[三(五氟苯基)膦]六氟锑酸金[P(C 6 F 5)3 AuSbF 6 ]优选产生1-茚满酮,而[(邻-联苯基)二(叔丁基)膦]三氟化金[P(t Bu)2(o-联苯)AuNTf 2]在二氯乙烷中往往会形成2-茚满酮衍生物。对于2-茚满酮产品,我们分离了两个茚基甲基醚进行氘标记分析,为π-炔烃活化提供了证据。
A Pd‐Catalyzed Annulation Strategy to Linearly Fused Functionalized N‐Heterocycles
作者:Larry Hoteite、Benjamin D. W. Allen、Ms. Ergaiya A. Elhajj、Anthony J. H. M. Meijer、Joseph P. A. Harrity
DOI:10.1002/chem.202400116
日期:2024.4.11
annulation strategy to linearly fused polycyclic piperidines from readily available substrates. These products can be chemoselectively functionalized to generate analogs that represent commonsubstructures in bioactive compounds.