Palladium(II)-Catalyzed Cyclizative Cross-Coupling of<i>ortho</i>-Alkynylanilines with<i>ortho</i>-Alkynylbenzamides under Aerobic Conditions
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201307738
日期:2013.12.2
Born to couple: The Pd(OAc)2‐catalyzed reaction of o‐alkynylanilines (1) with o‐alkynylbenzamides (2) affords the cyclizative cross‐coupling products 3 in good to excellent yields. Three bonds are created in the formation of two heterocycles tethered by a tetrasubstituted double bond. Mechanistic studies indicate that the reaction is initiated by aminopalladation with subsequent oxypalladation, N‐demethylation
Pd/C-Catalyzed Cyclizative Cross-Coupling of Two<i>ortho</i>-Alkynylanilines under Aerobic Conditions: Synthesis of 2,3′-Bisindoles
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201501020
日期:2015.5.11
A palladium‐catalyzed cyclizative cross‐coupling of two o‐alkynylanilines to 2,3′‐bisindoles underaerobic oxidative conditions was developed. Mechanistic studies suggested that the two catalytic cycles, namely the formation of 3‐alkynylindoles 8 and their subsequent cyclization to bisindoles 5, are temporally separated. The aminopalladation of 3‐alkynylindoles 8 occurred only after all the N,N‐di
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
Palladium(II)-Catalyzed Intramolecular Diamination of Alkynes under Aerobic Oxidative Conditions: Catalytic Turnover of an Iodide Ion
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201201640
日期:2012.5.21
“I” did it: A sequential intramolecular amination/N‐demethylation/amidation of internal acetylenes in the presence of a catalytic amount of Pd(OAc)2 and nBu4NI afforded indolo[3,2‐c]isoquinolinones under mild aerobic conditions (see scheme, DMSO=dimethyl sulfoxide). The iodide ion was regenerated by reaction of in situ generated MeI with HOAc present in the reaction mixture.
“我”做到了:在催化量的Pd(OAc)2和n Bu 4 NI存在下,通过顺序进行分子内胺化/ N-去甲基化/内部乙炔酰胺化,在轻度需氧条件下提供了吲哚[3,2- c ]异喹啉酮条件(参见方案,DMSO =二甲基亚砜)。通过原位生成的MeI与反应混合物中存在的HOAc反应,可再生碘离子。
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。