Palladium(II)-catalyzed intramolecular addition of arylboronic acids to ketones
作者:Guixia Liu、Xiyan Lu
DOI:10.1016/j.tet.2008.05.056
日期:2008.7
A palladium(II)-catalyzed intramolecular addition of arylboronic acids to ketones was developed. Compared to Pd(OAc)2 catalysis system, cationic palladium complex with dppp as the ligand has higher catalytic activity and efficiency for wider scope of substrates. From this reaction, the normal addition product or the dehydrated product could be selectively furnished as controlled by additives. Highly
ZnBr<sub>2</sub>-Mediated Cascade Reaction of <i>o</i>-Alkoxy Alkynols: Synthesis of Indeno[1,2-<i>c</i>]chromenes
作者:Amol Milind Garkhedkar、Gopal Chandru Senadi、Jeh-Jeng Wang
DOI:10.1021/acs.orglett.6b03642
日期:2017.2.3
A Lewis acid-mediatedcascade annulation of o-alkoxy alkynols in the presence of ZnBr2 has been developed. The cascadecyclization proceeds through a 5-exo-dig cyclization followed by a Friedel–Crafts reaction and ring-opening sequence to synthesize indeno[1,2-c]chromenes. This protocol provides a broad substrate scope in moderate to good yields with high regioselectivity. The reaction with benzo-fused
已经开发了在ZnBr 2存在下路易斯酸介导的邻烷氧基炔醇的级联环化反应。级联环化是通过5- exo- dig环化进行的,然后进行Friedel-Crafts反应和开环序列以合成茚并[1,2- c ]色烯。该方案以中等至良好的产率和高的区域选择性提供了广泛的底物范围。与苯并稠合的环烷基酮的反应产生了意外的炔烃C–C键断裂,从而导致了稠合的多环。
<i>p</i>-TsOH promoted synthesis of benzo-fused O-heterocycles from alkynols<i>via</i>ring contraction and C–O scission strategy
作者:Gopal Chandru Senadi、Jeh-Jeng Wang
DOI:10.1039/c8gc00749g
日期:——
Here, we report the first divergent synthesis of benzo-fused O-heterocycles by p-toluene sulfonic acid promoted cascade reactions involving alkyne hydration, doublecyclization, ring contraction and C–O bond cleavage from alkynols. The reaction mechanism was validated by obtaining the X-ray structure of fused benzo[b]oxepine intermediates. Moreover, some of the obtained derivatives could be transformed
在这里,我们报道了由对甲苯磺酸促进苯并稠合的O杂环的首次发散合成,该反应促进了级联反应,涉及炔烃水合,双环化,环收缩和炔醇裂解C-O键。通过获得熔融的苯并[ b ]氧杂环庚烷中间体的X射线结构来验证反应机理。而且,一些获得的衍生物可以转化为2,3-二取代的萘醌,作为天然产物和生物活性分子中的重要结构基序。
A Regioselective [3 + 2] Cycloaddition of Alkynols and Ketones To Access Diverse 1,3-Dioxolane Scaffolds
作者:Ganesh Kumar Dhandabani、Palaniraja Jeyakannu、Chia-Ling Shih、Aksa Mariyam Abraham、Gopal Chandru Senadi、Jeh-Jeng Wang
DOI:10.1021/acs.joc.3c01820
日期:2024.1.5
[3 + 2] cycloaddition reaction of alkynols with ketones, leading to the synthesis of 4-methylene-1,3-dioxolane derivatives. Remarkably, without any Thorpe–Ingold induced effect, the cyclization reaction was demonstrated with complete regio- and chemoselectivity, which was solely promoted by cesium carbonate. A wide range of unactivated ketones are viable under these mild reaction conditions, and both