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.
Lewis Acid-Catalyzed Cascade Reactions of Arylmethylenecyclopropanes with 1,1,3-Triarylprop-2-yn-1-ols or Their Methyl Ethers
作者:Liang-Feng Yao、Min Shi
DOI:10.1021/ol7022592
日期:2007.12.1
3-methoxy-1,3,3-triarylprop-1-yne 2 or 1,1,3-triarylprop-2-yn-1-ol 2-OH to give the corresponding functionalized methylenecyclobutene, cyclobutane, and cyclopropane derivatives in the presence of Lewisacid BF3.OEt2 under mild conditions. A plausible Meyer-Schuster rearrangement mechanism has been proposed.
Silver-mediated oxidative C–C bond sulfonylation/arylation of methylenecyclopropanes with sodium sulfinates: facile access to 3-sulfonyl-1,2-dihydronaphthalenes
sulfonylation/arylation of a C–C σ-bond in methylenecyclopropanes with sodium sulfinates to synthesize various 3-sulfonylated 1,2-dihydronaphthalenes is reported. This sulfonylation/arylation transformation proceeds via a sequence of sulfonylation, C–C σ-bond cleavage and intramolecular cyclization, and the experimental results show that the C–C σ-bond difunctionalization reaction includes a radical process. This
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