Synthesis of Substituted Benzo[<i>b</i>]thiophenes via Base-Promoted Domino Condensation–Intramolecular C–S Bond Formation
作者:Yogendra Kumar、Hiriyakkanavar Ila
DOI:10.1021/acs.orglett.1c00085
日期:2021.3.5
A novel synthesis of 2,3-substituted benzothiophenes is reported, involving a tandem base-mediated condensation of o-iodoarylacetonitriles/acetates/ketones with (hetero)aryldithioesters and an intramolecular C–S bond formation. The reaction affords diversely substituted benzothiophenes and heterofused thiophenes in excellent 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。
Diversity-Oriented Synthesis of Substituted Benzo[<i>b</i>]thiophenes and Their Hetero-Fused Analogues through Palladium-Catalyzed Oxidative CH Functionalization/Intramolecular Arylthiolation
作者:Anand Acharya、S. Vijay Kumar、Hiriyakkanavar Ila
DOI:10.1002/chem.201501828
日期:2015.11.16
benzo[b]thiophenes has been developed throughpalladium‐catalyzed intramolecular oxidative CH functionalization–arylthiolation of enethiolate salts of α‐aryl‐β‐(het)aryl/alkyl‐β‐mercaptoacrylonitriles/acrylates or acrylophenones. The overall strategy involves a one‐pot, two‐step process in which enethiolate salts [generated in situ through base‐mediated condensation of substituted arylacetonitriles, deoxybenzoins
New benz[c]benzothiopheno[2,3-e]azepine derivatives 1 of potential biological properties were synthesised in four steps from bromobenzo[b]thiophene. The synthetic pathway is based on ‘Heck-type’ and Pictet-Spengler reactions.