Convenient one-pot synthesis of vinylic sulfides from thioalkynes via a catalytic hydroboration-coupling sequence
摘要:
A variety of vinylic sulfides are stereospecifically synthesized by the catalytic hydroboration of thioacetylenes with catecholborane followed by cross-coupling of the resulting boron derivatives with organic halides. The use of the same palladium catalyst for both stages allows the whole transformation to be carried out in one flask. The synthetic utility of the method is demonstrated by the transformation of vinylic sulfides into diene, indole, and naphtho[b]furan derivatives.
Electrochemical Dearomative 2,3-Difunctionalization of Indoles
作者:Ju Wu、Yingchao Dou、Régis Guillot、Cyrille Kouklovsky、Guillaume Vincent
DOI:10.1021/jacs.8b13371
日期:2019.2.20
oxidative dearomatization of indoles leading to 2,3-dialkoxy or 2,3-diazido indolines under undivided conditions at a constant current. This operationally simple electro-oxidative procedure avoids the use of an external oxidant and displays excellent functional group compatibility. The formation of the two C-O or C-N bonds is believed to arise from the oxidation of the indoles into radical cation intermediates
我们报告了使用电化学对吲哚进行直接氧化脱芳构化,在恒定电流下在未分开的条件下产生 2,3-二烷氧基或 2,3-二叠氮二氢吲哚。这种操作简单的电氧化程序避免了使用外部氧化剂并显示出优异的官能团兼容性。两个 CO 或 CN 键的形成被认为是由吲哚氧化成自由基阳离子中间体引起的。
Triflic Acid as an Efficient Brønsted Acid Promoter for the Umpolung of N-Ac Indoles in Hydroarylation Reactions
作者:Raj Kumar Nandi、Alejandro Perez-Luna、Didier Gori、Rodolphe Beaud、Régis Guillot、Cyrille Kouklovsky、Vincent Gandon、Guillaume Vincent
DOI:10.1002/adsc.201701074
日期:2018.1.4
We report that triflicacid, a strong Brønsted acid, is a very powerful alternative to FeCl3 to mediate the hydroarylation of N−Ac indoles, which delivers regioselectively 3‐arylindolines, 3,3‐spiroindolines or 2‐arylindolines. Mechanistic explorations point towards the existence of a highly electrophilic intermediate by simultaneous activation of the acetyl and of the C2=C3 bond by protons.
Direct Oxidative Coupling of<i>N</i>-Acetyl Indoles and Phenols for the Synthesis of Benzofuroindolines Related to Phalarine
作者:Terry Tomakinian、Régis Guillot、Cyrille Kouklovsky、Guillaume Vincent
DOI:10.1002/anie.201404055
日期:2014.10.27
by the biogenetic synthesis of benzofuroindoline‐containing natural products, we designed an oxidative coupling between phenol and N‐acetyl indoles. This straightforward and direct radical process, mediated by 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone and FeCl3 allowed the regioselective synthesis of benzofuro[3,2‐b]indolines, whose structure is found in the natural product phalarine.
Ruthenium-Catalyzed Cycloisomerization of 2-Alkynylanilides: Synthesis of 3-Substituted Indoles by 1,2-Carbon Migration
作者:Takuma Watanabe、Yuichiro Mutoh、Shinichi Saito
DOI:10.1021/jacs.7b04564
日期:2017.6.14
We developed ruthenium-catalyzedcycloisomerization of alkynylanilides that gave 3-substituted indoles in high yields. The reaction proceeded via the disubstituted vinylidene ruthenium complex that was formed by the 1,2-carbon migration.
Dearomative Diallylation of <i>N</i>-Acylindoles Mediated by FeCl<sub>3</sub>
作者:Ju Wu、Raj Kumar Nandi、Régis Guillot、Cyrille Kouklovsky、Guillaume Vincent
DOI:10.1021/acs.orglett.8b00361
日期:2018.4.6
Three-dimensional indolines possessing two contiguous-stereogenic centers were obtained stereoselectively via the FeCl3-mediated dearomative introduction of two allyl groups to N-acylindoles with allyltrimethylsilane. Synthetic transformations allowed obtention of trans-tetrahydrocarbazoles and an aza[4.4.3]propellane scaffold by RCM. Selective hydration of one of the allyl groups was also achieved.