已经探索了通过调节合适的配体对未活化的环烯烃进行 Cu 催化的高化学选择性三氟甲基化反应。Cu(I)/适当的配体催化系统克服了区分涉及自由基中间体的两条途径的关键挑战,并为位点特异性螺芳基三氟甲基化和氯三氟甲基化提供了一种配体控制的方法,以提供三氟甲基化的螺四氢喹啉化合物和邻位含氯的化合物三氟甲基环烷烃。此外,与报道的氯源相比,1,2-二氯乙烷被用作三氟氯甲基化的更绿色、更经济的原料。
Synthesis of Spiro-dihydroquinoline and Octahydrophenanthrene Derivatives via Palladium-Catalyzed Intramolecular Oxidative Arylation
作者:Zhong-Lin Zang、Shuklachary Karnakanti、Sheng Zhao、Ping Hu、Zhen Wang、Pan-Lin Shao、Yun He
DOI:10.1021/acs.orglett.7b00228
日期:2017.3.17
A method for intramolecular sp2 C–H oxidative arylation of unactivated cyclic olefins has been developed to access spiro-dihydroquinoline and octahydrophenanthrene derivatives in a straightforward and efficient manner. Bearing picolinamide as a directing group, the alkenyl anilines cyclized to afford spiro-dihydroquinolines in moderate to excellent yields via direct oxidative arylation, while the alkenyl
Intramolecular nitration–aminocarbonylation of unactivated olefins: metal-free synthesis of γ-lactams
作者:Dong Chen、Meishan Ji、Chen Zhu
DOI:10.1039/c9cc03736e
日期:——
Disclosed herein is a novel, metal-free synthesis of γ-lactams through the radical-mediated nitration–aminocarbonylation of unactivated olefins. The reaction is initiated by a nitro radical generated from the homolysis of tert-butyl nitrite. The intramolecular cyanamide serves as the aminocarbonylating reagent. This protocol offers an environment-benign method to produce the synthetically valuable