Bismuth-catalyzed synthesis of anthracenes via cycloisomerization of o-alkynyldiarylmethane
作者:Jungmin Park、Hyuck Choi、Deug-Chan Lee、Kooyeon Lee
DOI:10.1016/j.tetlet.2015.10.111
日期:2015.12
In this study, anthracenes were efficiently synthesized from o-alkynyldiarylmethane using a novel method that exploits the synergistic effect between Bi(OTf)3 as the catalyst, and trifluoroacetic acid (TFA). Through this reaction, we achieved the rapid and efficient synthesis of anthracenes bearing various functional groups under mild conditions.
Coupling N–H Deprotonation, C–H Activation, and Oxidation: Metal-Free C(sp<sup>3</sup>)–H Aminations with Unprotected Anilines
作者:Christopher J. Evoniuk、Gabriel dos Passos Gomes、Sean P. Hill、Satoshi Fujita、Kenneth Hanson、Igor V. Alabugin
DOI:10.1021/jacs.7b07519
日期:2017.11.15
An intramolecular oxidativeC(sp3)–H amination from unprotected anilines and C(sp3)–H bonds readily occurs under mild conditions using t-BuOK, molecular oxygen and N,N-dimethylformamide (DMF). Success of this process, which requires mildly acidic N–H bonds and an activated C(sp3)–H bond (BDE < 85 kcal/mol), stems from synergy between basic, radical, and oxidizing species working together to promote
An I2-mediated synthesis of phenanthridines via intramolecular sp3 C-H amination of readily accessible aniline precursors is reported. The present synthetic process is straightforward and applicable to a broad variety of unprotected aniline substrates, and provides facile and efficient access to phenanthridine derivatives. This C-H amination protocol does not use transition metals, is operationally
Diarylmethane synthesis through Re<sub>2</sub>O<sub>7</sub>-catalyzed bimolecular dehydrative Friedel–Crafts reactions
作者:Qi Qin、Youwei Xie、Paul E. Floreancig
DOI:10.1039/c8sc03570a
日期:——
describes the application of Re2O7 to the syntheses of diarylmethanes from benzylic alcohols through solvolysis followed by Friedel–Craftsalkylation. The reactions are characterized by broad substrate scope, low catalyst loadings, high chemical yields, and minimal waste generation. The intermediate perrhenate esters are superior leaving groups to chlorides and bromides in these reactions. The polarity
该手稿描述了 Re 2 O 7在通过溶剂分解和弗里德尔-克来福特烷基化从苯甲醇合成二芳基甲烷中的应用。该反应的特点是底物范围广、催化剂负载量低、化学产率高和废物产生最少。在这些反应中,中间体高铼酸酯是优于氯化物和溴化物的离去基团。六氟异丙醇的极性和水封存能力对于这些过程的成功至关重要。Re 2 O 7是 HOReO 3的预催化剂,可作为这些反应的成本较低且易于处理的促进剂。氧铼催化剂在类似取代的乙酸酯存在下选择性地活化醇,这表明与布朗斯台德酸催化相比具有独特的化学选择性和机制。
Synthesis of spiro[isobenzofuran-1(3H),4'-piperidines] as potential central nervous system agents. 5. Conformationally mobile analogs derived by furan ring opening
作者:Lawrence L. Martin、Solomon S. Klioze、Manfred Worm、Charles A. Crichlow、Harry M. Geyer、Hansjoerg Kruse
DOI:10.1021/jm00197a013
日期:1979.11
Synthesis and antitetrabenazine activity of 4-[2-(arylmethyl)phenyl]piperidines and 4-(benzyloxy)-4-phenylpiperidines, prepared as simplified and possibly more readily synthesized analogues of 3-phenylspiro[isobenzofuran-1 (3H),4'-piperidine], are reported. Several 4-[2-(arylmethyl)phenyl]piperidines display antitetrabenazine activity comparable to imipramine or amitriptyline but are two- to fourfold