Copper(I)-Catalyzed Intramolecular Trifluoromethylation of Methylenecyclopropanes
作者:Zi-Zhong Zhu、Kai Chen、Liu-Zhu Yu、Xiang-Ying Tang、Min Shi
DOI:10.1021/acs.orglett.5b02940
日期:2015.12.18
Copper(I)-catalyzed intramolecular trifluoromethylation of methylenecyclopropanes has been developed to produce a variety of CF3-substituted dihydronaphthalenes in moderate to good yields, relying on the construction of C(sp2)–CF3 bonds under mild conditions. The reactions proceed through a radical process under copper(I) catalysis with a good compatibility for the functional group.
Without using any transitionmetal and base, an eco‐friendly, practical and economical protocol has been established for the one‐potsynthesis of diverse (E)‐1‐phenyl‐4‐sulfonylbut‐1‐enes from easily accessible starting materials. This strategy features a wide substrate scope, tolerates a broad range of functional groups, employs a less expensive oxidant, is operationally simple, and can be easily scaled‐up
A novel and efficient AgNO3-facilitated oxidative C–C σ-bond difunctionalization of alkylidenecyclopropanes with α-ketoacids for preparing 2-acyl-substituted 3,4-dihydronaphthalenes is developed. This radical acylation/arylation transformation proceeds via decarboxylation of the α-ketoacid, acylation of the carbon–carbon double bond, cleavage of the carbon–carbon σ-bond, and cyclization with a connected
Copper/B<sub>2</sub>pin<sub>2</sub>-Catalyzed Difluoroalkylation of Methylenecyclopropanes with Bromodifluorinated Acetates and Acetamides: One-Pot Synthesis of CF<sub>2</sub>-Containing Dihydronaphthalene Derivatives
作者:Chuang Liu、Yan-Jie Yang、Jun-Ying Dong、Ming-Dong Zhou、Lei Li、He Wang
DOI:10.1021/acs.joc.9b01106
日期:2019.8.16
Novel copper/B2pin2-catalyzed difluoroalkylation of methylenecyclopropanes with bromodifluorinated acetates and acetamides via a tandem radical process involving ring-opening/intramolecular cyclization has been reported. This protocol is not only tolerated to a diverse range of substrates but also applicable to the synthesis of useful difluoromethylated compounds. Moreover, the reaction could be performed
已经报道了经由涉及开环/分子内环化的串联自由基过程的新型铜/ B 2 pin 2催化的亚甲基环丙烷与溴代二氟乙酸盐和乙酰胺的二氟烷基化。该方案不仅可耐受多种底物,而且可用于合成有用的二氟甲基化化合物。此外,该反应可以以克的规模高产率地进行,这为实际应用开辟了可能性。
Metal-Free Oxidative C–C Bond Functionalization of Methylenecyclopropanes with Ethers Leading to 2-Substituted 3,4-Dihydronaphthalenes
methylenecyclopropanes with ethers was established for the synthesis of diverse 2-substituted 3,4-dihydronaphthalenes with high selectivity and efficiency. This oxidative cyclization is achieved by C(sp3)-H functionalization, ring-opening, and cyclization, and this method represents a new example of methylenecyclopropane oxidative cyclization with an aromatic carbon and a C(sp3)-H bond by simultaneously