Copper-Catalyzed Acyloxycyanation of Alkynes with Acetonitrile: Regioselective Construction of Cyclic Acrylonitriles by 6-<i>endo</i>
or 5-<i>exo</i>
Cyclization
作者:Yamin Zhu、Zengming Shen
DOI:10.1002/adsc.201700577
日期:2017.10.25
difunctionalization of alkynes by tandem iodolactonization and copper‐catalyzedcyanation using acetonitrile as a cyanating reagent is reported for the first time. This approach can afford cyano‐containing isocoumarin or phthalide derivatives in good yields by careful choice of the carboxylate nucleophiles and electrophilic iodine sources. Thus, an acyloxycyanation strategy can be achieved in good yields
One-pot synthesis of 2,3-substituted benzo[b]thiophenes via Cu(<scp>i</scp>) catalysed intramolecular cyclisation from dithioesters
作者:Nagarakere. C. Sandhya、Kebbahalli. N. Nandeesh、Kanchugarakoppal. S. Rangappa、Sannaiah. Ananda
DOI:10.1039/c5ra02114f
日期:——
Efficient synthesis of benzo[b]thiophenes from o-halophenyl acetonitrile has been achieved. This novel one-pot procedure involves CuI and pivalic acid catalyzed C–S bond formation using dithioesters followed by a heterocyclization reaction. This efficient protocol has the advantages of one-pot synthesis, short reaction time, good yields (62–78%) and operational simplicity.
已从邻卤代苯基乙腈高效合成苯并[ b ]噻吩。这种新颖的一锅法涉及使用二硫代酯和CuI和新戊酸催化的C–S键形成,然后进行杂环化反应。这种高效的方法具有一锅法合成,反应时间短,产率高(62-78%)和操作简便的优点。
Synthesis of new 2-arylbenzo[ b ]thiophenes using ‘Heck-type’ technology
作者:Jérémie Fournier Dit Chabert、Christel Gozzi、Marc Lemaire
DOI:10.1016/s0040-4039(02)00128-4
日期:2002.3
Direct 3-substituted benzothiophene arylationusing a Heck-type reaction with Pd(OAc)2/n-Bu4NBr as a catalyticsystem is reported. This reaction was found to perform relatively fast whatever the electron-donating or the electron-withdrawing group at position 3. We also extended this reaction to several aromatic halides, such as benzene, naphthalene and pyridine derivatives, synthesising new 2-arylbenzo[b]thiophenes
报道了使用Pd(OAc)2 / n- Bu 4 NBr作为催化体系的Heck型反应直接进行3-取代的苯并噻吩芳基化反应。发现该反应无论在3位上的供电子基团还是吸电子基团上都相对较快地进行。我们还将这一反应扩展到了几种芳族卤化物,例如苯,萘和吡啶衍生物,合成了新的2-芳基苯并[ b ]。噻吩产量中等至良好。