Ruthenium-Catalyzed Transfer Oxygenative [2 + 2 + 1] Cycloaddition of Silyldiynes Using Nitrones as Adjustable Oxygen Atom Donors. Synthesis of Bicyclic 2-Silylfurans
摘要:
The first example of the Ru-catalyzed transfer oxygenative [2 + 2 + 1] cycloaddition of silyldiynes to produce bicyclic 2-silylfurans is described. This cyclization process was realized using nitrones as readily available and adjustable oxygen atom donors. The bicyclic silylfuran products could be used as platforms for a diverse range of functionalized furans.
Cocyclization of bis(trimethylsilyl)- and bis(trimethylstannyl)di-2-propynyl ether with acetonitrile provides a synthetic entry into 1,3-dihydro-6-methyl-4,7-bis(trimethylsilyl)- and bis(trimethylstannyl)-furo[3,4-c]pyridines. Regioselective electrophilic substitution of the respective silyl or stannyl groups allows for a regiocontrolled construction of tetrasubstituted pyridines. This method has been
双(三甲基甲硅烷基)-和双(三甲基锡烷基)二-2-丙炔基醚与乙腈的共环化可合成1,3-二氢-6-甲基-4,7-双(三甲基甲硅烷基)-和双(三甲基锡烷基)-呋喃[3,4- c ]吡啶。各自的甲硅烷基或苯乙烯基的区域选择性亲电子取代允许区域控制的四取代吡啶的构建。该方法已应用于维生素B 6的全合成。
Kobalt-katalysiert Cycloadditionen von Alkinen und Nitrilen zu Pyridinen: Ein neuer Zugang zu Pyridoxin (Vitamin B6)
作者:Rudolf E. Geiger、Michel Lalonde、Hansij�rg Stoller、Kuno Schleich
DOI:10.1002/hlca.19840670513
日期:1984.8.8
Cobalt-Catalyzed Cycloaddition of Alkynes and Nitriles to Pyridines: A New Route to Pyridoxine (Vitamin B6)
Nickel-catalyzed [3 + 2] cycloaddition of diynes with methyleneaziridines via C–C bond cleavage
作者:Bin Pan、Chunxiang Wang、Dongping Wang、Fan Wu、Boshun Wan
DOI:10.1039/c3cc41061g
日期:——
A Ni-catalyzed [3 + 2] cycloaddition via CâC bond cleavage of methyleneaziridines under mild conditions was developed. This reaction gave substituted pyrroles with excellent regioselectivity and a pendant alkyne unit, which is advantageous for further derivatization.
在温和的条件下,开发出了一种通过 CâC 键裂解亚甲基氮丙啶的 Ni 催化 [3 + 2] 环加成反应。该反应生成的取代吡咯具有极佳的区域选择性和一个悬垂炔烃单元,有利于进一步衍生。
Bifunctional (Cyclopentadienone)Iron-Tricarbonyl Complexes: Synthesis, Computational Studies and Application in Reductive Amination
Reductive amination under hydrogen pressure is a valuable process in organic chemistry to access amine derivatives from aldehydes or ketones. Knölker’s complex has been shown to be an efficient iron catalyst in this reaction. To determine the influence of the substituents on the cyclopentadienone ancillary ligand, a series of modified Knölker’s complexes was synthesised and fully characterised. These
Investigations on the synthesis of monoarylated diynes by monoprotection/cross-coupling/deprotection approach
作者:Karolin Kral、Marko Hapke
DOI:10.1016/j.tetlet.2012.03.118
日期:2012.6
The presented experimental work investigates the usefulness of temporary monoprotection of symmetrical terminal diynes in the coupling with aryl iodides. The monoprotection/cross-coupling/deprotection approach proved to be efficient for the coupling of diynes with aryl substrates avoiding the formation of diarylated byproducts. The high importance of the ratio of solvents in the Sonogashira coupling