Palladium complexes with an annellated mesoionic carbene (MIC) ligand: catalytic sequential Sonogashira coupling/cyclization reaction for one-pot synthesis of benzofuran, indole, isocoumarin and isoquinolone derivatives
作者:Akshi Tyagi、Noor U Din Reshi、Prosenjit Daw、Jitendra K. Bera
DOI:10.1039/d0dt02918a
日期:——
Two Pd(II) complexes (1 and 2) featuring a fused π-conjugated imidazo[1,2-a][1,8]naphthyridine-based mesoionic carbene ligand have been synthesized and structurally characterized. Both complexes effectively catalyze the one-pot synthesis of benzofuran starting from phenylacetylene and 2-iodophenol under mild conditions. Complex 1 is found to be an excellent catalyst for the straightforward access to
合成了两个Pd(II)配合物(1和2),这些配合物具有基于π-共轭咪唑并[1,2- a ] [1,8]萘啶基的介电卡宾配体的稠合结构。两种络合物在温和条件下均能有效地催化苯乙炔和2-碘苯酚的一锅法合成苯并呋喃。通过末端炔烃与苯酚,N-甲基苯胺,苯甲酸和N的2-碘衍生物的反应,发现配合物1是直接访问苯并呋喃,吲哚,异香豆素和异喹诺酮衍生物库的极佳催化剂。-甲基苯甲酰胺。使用多种不同取代的末端炔烃证明了催化方法的通用性,并以良好或优异的收率获得了相应的所需产物。在对照实验的基础上,提出了一种二循环机理,该机理涉及2-碘衍生物与炔烃的Sonogashira偶联以及随后的相应2-炔基化合物的环化。
Intramolecular Peterson olefination of ortho-trimethylsilylmethyl-N-acyl-N-alkylbenzamides. A new route to 2-alkyl-1(2H)isoquinolones
作者:Axel Couture、Hélène Cornet、Pierre Grandclaudon
DOI:10.1016/0022-328x(92)83479-2
日期:1992.11
A variety of 2-alkyl-1(2H)isoquinolones has been efficiently synthesized by intramolecularPetersonolefination of ortho-trimethylsilylmethyl-N-acyl-N-alkylbenzamides.
A palladium-catalyzed controlled 6-endo-dig cyclization process has been developed for the chemoselective synthesis of isoquinolin-1-ones from N-alkoxy-o-alkynylbenzamides. The mechanism and scope of the reaction have also been investigated. Deuterium-labeling studies were used to confirm the intramolecular 1,5-hydrogen shift as a key step in the transformation.
A Convenient Synthesis of 3-Aryl-2-Methyl-3,4-Dihydro-1(2<i>H</i>)-Isoquinolones and -1,2,3,4-Tetrahydroisoquinolines
A new methodology for the synthesis of 3-aryl-2-methyl-3,4-dihydro-2H-isoquinolin-1-ones and 3-aryl-2-methyl-1,2,3,4-tetrahydroisoquinolines is reported.
Reaction Outcome Critically Dependent on the Method of Workup: An Example from the Synthesis of 1-Isoquinolones