Palladium catalysed intramolecular coupling of aryl and benzylic halides and related tandem cyclisations. A simple synthesis of hippadine.
摘要:
A Pd(0)/R3Sn)2 (R = Me or n-Bu) catalyst system effects intramolecular aryl-aryl, benzyl-aryl, benzyl-benzyl coupling of aryl and benzyl halides in good yield. Polycyclisations can be achieved by relaying the coupling via an alkene or alkyne ''linker''. The methodology is exemplified by a short synthesis of hippadine.
Synthesis of 2,3-Disubstituted Quinazolinone Derivatives through Copper Catalyzed C-H Amidation Reactions
作者:Trimurtulu Kotipalli、Veerababurao Kavala、Donala Janreddy、Vijayalakshmi Bandi、Chun-Wei Kuo、Ching-Fa Yao
DOI:10.1002/ejoc.201501552
日期:2016.2
The synthesis of quinazolinone derivatives was achieved from 2-iodobenzamide derivatives and various benzylamines, allylamine, and cinnamylamine derivatives through a one-pot copper-catalyzed reaction. In this reaction, the amine component (benzylamine/allylamine/cinnamylamine) is N-arylated with 2-iodobenzamide derivatives through Ullman coupling, followed by an intramolecular C–H amidation in the
An efficient copper-catalyzed reaction for the synthesis of benzisothiazol-3(2H)-ones has been developed, starting from easily available 2-halobenzamides and carbondisulfide, which gave the corresponding target products in 30–89% yield for 25 examples. The reaction proceeds via a consecutive process with S–C bond and S–N bond formation.
Sequential Heck–Heck reactions for the dibenz[a,f]indolizine skeleton: synthetic application to decumbenine B
作者:Bok-Jin Lee、Gil-Pyo Hong、Guncheol Kim
DOI:10.1016/j.tetlet.2016.10.064
日期:2016.11
the synthesis of dibenz[a,f]indolizine skeleton. Heck reaction for the 5-membered ring first and the following Heck reaction provided the 6-membered ring next. For the synthetic application properly arranged diiodo-aromatic intermediate has been prepared and subjected to the sequential Heck reactions, and the following decarboxylation provided the known precursor of decumbenine B.
A one-potstrategy for the synthesis of 3-hydroxy-3-furylisoindolinone derivatives is reported. The reaction proceeds via a copper-catalyzed oxidative cascade inter-molecular double cyclization of 2-iodobenzamide derivatives and propargyl dicarbonyl compounds in the presence of oxygen. The strategy involves several reactions including cyclization/coupling/double C(sp3)−H functionalization in a cascade
Substituted 3-(arylmethylene)isoindolin-1-ones can be efficiently synthesized in a stereoselective manner from various ynamides and boronic acids by palladium-catalyzed Heck-Suzuki-Miyaura domino reactions.