A new synthetic approach for the synthesis of indolo[2,3-b]quinolines and benzothieno[2,3-b]quinolines has been developed by employing the freshly prepared o-alkynylisocyanobenzenes derived from o-alkynylformamide derivatives as substrates. The synthetic transformations involved chloride-ion-triggered 6-endo cyclization of o-alkynylisocyanobenzenes to generate 2-chloroquinolines in situ, which further
The gold rush: A cationic gold(I) complex, supported by a CAAC ligand, promotes the intramolecular addition of NH or NMe bonds (from ammonium salts or tertiary amines, respectively) to carbon–carbon triple bonds; the same complex allows for the isolation of vinylgold intermediates. X=(C6F5)4B. CAAC=cyclic (alkyl)(amino)carbene.
淘金热:由 CAAC 配体支持的阳离子金 (I) 络合物促进 N H 或 N Me 键(分别来自铵盐或叔胺)与碳-碳三键的分子内加成;相同的复合物允许分离乙烯基金中间体。X=(C 6 F 5 ) 4 B.CAAC=环状(烷基)(氨基)卡宾。
Synthesis of indolo- and benzothieno[3,2-<i>c</i>]quinolines <i>via</i> POCl<sub>3</sub> mediated tandem cyclization of <i>o</i>-alkynylisocyanobenzenes derived from <i>o</i>-alkynyl-<i>N</i>-phenylformamides
A synthesis of indolo[3,2-c]quinolines and benzothieno[3,2-c]quinolines has been developed employing o-alkynyl-N-phenylformamide derivatives as the substrates. The reaction proceeded via a tandem process involving POCl3-assisted intramolecular cyclization of the firstly formed o-alkynylisocyanobenzenes, leading to the desired products in moderate to high yields. Furthermore, the reaction is efficient
使用邻炔基-N-苯基甲酰胺衍生物作为底物,开发了吲哚并[3,2- c ]喹啉和苯并噻吩并[3,2- c ]喹啉的合成方法。该反应通过串联过程进行,包括 POCl 3辅助的分子内环化首先形成的邻炔基异氰基苯,以中等至高产率产生所需的产物。此外,该反应在克级上是有效的,并且通过胺化、Suzuzki-Miyaura 反应和 Heck 交叉偶联对产物进行了结构修饰。几种选定吲哚的光物理性质[3,2- c] 喹啉通过紫外可见和荧光光谱进行了研究,并使用时间相关的 DFT 计算进行了合理化。
Palladium(II)-Catalyzed Tandem Cyclization/C–H Functionalization of Alkynes for the Synthesis of Functionalized Indoles
A palladium-catalyzed tandem cyclization/C-H functionalization of two alkynes was accomplished to construct a series of polycyclic functionalized indoles. A range of internal alkynes bearing synthetically useful functional groups were tolerated. A good regioselectivity was observed when alkyl-substituted alkynes were introduced into the reaction system, and a single product was obtained. Molecular oxygen was used as the terminal oxidant in the approach, rendering the reaction more sustainable.