synthesis of chiral tetrahydroquinoline derivatives with excellent enantioselectivities and high yields has been developed through one‐pot cascade biomimetic reduction. The detailed reaction pathway includes the acid‐catalyzed and ruthenium‐catalyzedformation of aromatic quinoline intermediates and biomimetic asymmetric reduction.
single operation, and represent novel protocols for the expedient synthesis of both aromatic and partially aromatic pyrrolo[2,3‐c]quinoline derivatives from readily available precursors under metal‐free conditions. Notably, tetrahydro‐3H‐pyrrolo[2,3‐c]quinolones that bear three adjacent stereocenters were obtained in a highly diastereoselective manner.
已成功开发了甲苯磺酰基甲基异氰化物和异氰基乙酸酯与2-亚甲基氨基查耳酮作为aza-1,5-dielectrophiles的串联环化-环化反应。这些多米诺骨转化具有在一次操作中同时形成三个键和两个环的特点,并且代表了在无金属条件下方便地从易得的前体合成芳族和部分芳族吡咯并[2,3- c ]喹啉衍生物的新颖方法。值得注意的是,以高度非对映选择性的方式获得了带有三个相邻立体中心的四氢-3 H-吡咯并[2,3- c ]喹诺酮。
Selective Synthesis of Quinolines and Indoles: Sulfur-Assisted or Selenium-Catalyzed Reaction of β-(2-Nitrophenyl)-α,β-unsaturated Ketones with Carbon Monoxide
A simple and selective synthetic method of quinolines and indoles by the reaction of β-(2-nitrophenyl)-α,β-unsaturatedketones with carbonmonoxide was developed. When β-(2-nitrophenyl)-α,β-unsaturatedketones were allowed to react with carbonmonoxide and water in the presence of a stoichiometric amount of sulfur or a catalytic amount of selenium, the corresponding quinolines were produced in moderate-to-good
Pd-Catalyzed Cross-Coupling of Aryl Carboxylic Acids with Propiophenones through a Combination of Decarboxylation and Dehydrogenation
作者:Jun Zhou、Ge Wu、Min Zhang、Xiaoming Jie、Weiping Su
DOI:10.1002/chem.201200829
日期:2012.6.25
A Heck of a reaction: With a PCy3‐supported Pd catalyst, arylcarboxylicacids cross‐couple to saturated propiophenonesthrough a combination of decarboxylation and dehydrogenation to give chalcones bearing a variety of functional groups in generally good yields (see scheme). Furthermore, a one‐pot procedure, involving this reaction and a subsequent selective hydrogenative cyclization process, has
Iron-catalyzed intramolecular reductive cyclization of o-nitroarenes to indoles under visible light irradiation
作者:Mohd Waheed、Meshari A. Alsharif、Mohammed Issa Alahmdi、Sayeed Mukhtar、Humaira Parveen
DOI:10.1016/j.tetlet.2023.154543
日期:2023.6
An efficient, mild and environmentally benign methodology for the synthesis of indoles via air stable, inexpensive Knölker complexcatalyzedintramolecular reductive cyclization of o-nitrostyrenes at room temperature under photoirradiation has been developed. The stated methodology was capable for a diverse range of o-nitrostyrenes, generates outstanding yields of the indoles.