Et<sub>2</sub>Zn-Mediated Rearrangement of Bromohydrins
作者:Lezhen Li、Peijie Cai、Qingxiang Guo、Song Xue
DOI:10.1021/jo800231s
日期:2008.5.1
and highly efficient method for the rearrangement of bromohydrins mediated by Et2Zn to synthesize carbonylcompounds was described. Various β-bromo alcohols were treated with 0.6 equiv of Et2Zn to form a zinc complex in CH2Cl2 at room temperature for 2 h, followed by 1,2-migration to give the corresponding carbonylcompounds. This remarkable and clean rearrangement is general for acyclic and cyclic bromohydrins
Biarylphosphonite Gold(I) Complexes as Superior Catalysts for Oxidative Cyclization of Propynyl Arenes into Indan-2-ones
作者:Guilhem Henrion、Thomas E. J. Chavas、Xavier Le Goff、Fabien Gagosz
DOI:10.1002/anie.201301015
日期:2013.6.10
Striking gold: A series of variously functionalized propynyl arenes was smoothly converted into indan‐2‐ones by a new gold(I)‐catalyzed oxidative cyclization process. [LAu]NTf2 (Tf=trifluoromethanesulfonyl) is a superior catalyst both in terms of yield and kinetics for the present transformation.
打击金:通过新的金(I)催化的氧化环化工艺,一系列功能化的丙炔基芳烃被顺利转化为茚满-2-酮。就本转化而言,就收率和动力学而言,[ L Au] NTf 2(Tf =三氟甲磺酰基)是优良的催化剂。
[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。
Synthesis of Alkynyl Ethers and Low-Temperature Sigmatropic Rearrangement of Allyl and Benzyl Alkynyl Ethers
作者:Juan R. Sosa、Armen A. Tudjarian、Thomas G. Minehan
DOI:10.1021/ol802147h
日期:2008.11.6
transformed into 1-alkynyl ethers 5 by a two-step procedure involving formation of the enol triflate or phosphate and base-induced elimination. Performing the same reaction sequence with allylic alcohols (R2OH, R2 = allyl) furnishes instead gamma,delta-unsaturated carboxylic acid derivatives 6, derived from [3,3]-sigmatropic rearrangement of the intermediate allyl alkynyl ethers at -78 degrees C and trapping
Anti-Markovnikov Oxidation of β-Alkyl Styrenes with H<sub>2</sub>O as the Terminal Oxidant
作者:Guoting Zhang、Xia Hu、Chien-Wei Chiang、Hong Yi、Pengkun Pei、Atul K. Singh、Aiwen Lei
DOI:10.1021/jacs.6b07411
日期:2016.9.21
Oxygenation of alkenes is one of the most straightforward routes for the construction of carbonyl compounds. Wacker oxidation provides a broadly useful strategy to convert the mineral oil into higher value-added carbonyl chemicals. However, the conventional Wacker chemistry remains problematic, such as the poor activity for internal alkenes, the lack of anti-Markovnikov regioselectivity, and the high