enantioselective strategy for the construction of highly strained spiro[2,3]hexane skeletons from methylenecyclopropanes and a broad selection of α,β-unsaturated aldehydes. The reaction proceeds through a Michael addition followed by ring expansion of methylenecyclopropanes and nucleophilic attack of an enamine to realize the construction of spiro[2,3]hexanes. Key to the success of this approach are the
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
Visible-Light-Catalyzed C–C Bond Difunctionalization of Methylenecyclopropanes with Sulfonyl Chlorides for the Synthesis of 3-Sulfonyl-1,2-dihydronaphthalenes
A novel visible-light-catalyzed sulfonylation/arylation of carbon–carbon σ-bond with sulfonyl chlorides for the synthesis of 3-sulfonylated 1,2-dihydronaphthalenes is developed. This difunctionalization proceeds via a sequence of C═C bond sulfonylation, C–C σ-bond cleavage, and intramolecular cyclization, and the experiment result shows that the C–C σ-bond difunctionalization reaction includes a radical
Silver(I)-Mediated Dual Cleavage of C-C and C-O Bonds in the Reaction of Diarylmethylenecyclopropanes with Tetrahydrofuran: Synthesis of 4-(3-Halobut-3-enyloxy)butyl 2,2,2-Trifluoroacetate Derivatives
作者:Gen-Qiang Chen、Xiang-Ying Tang、Min Shi
DOI:10.1002/ejoc.201301262
日期:2014.1
The reaction of methylenecyclopropanes (MCPs) with tetrahydrofuran (THF) proceed smoothly in the presence of AgOC(O)CF3 and electrophilic halogenation reagents to give the corresponding 4-(3-halobut-3-enyloxy)butyl2,2,2-trifluoroacetatederivatives in moderate yields through dualcleavage of C–C and C–Obonds under mild conditions.
C(sp3)-C(sp3) Bond Breaking in Methylenecyclopropanes Involving a AuI/AuIII Catalytic Cycle
作者:Di-Han Zhang、Lun-Zhi Dai、Min Shi
DOI:10.1002/ejoc.201000765
日期:——
Gold(I) can catalyze the diacetoxylation of methylenecyclopropanes to produce the corresponding diacetoxylated products in moderate to good yields in acetic acid in the presence of iodosobenzene diacetate via C-C bondbreaking under mild condition
Gold(I) 可以在二乙酸碘苯酯的存在下,在温和条件下通过 CC 键断裂,催化亚甲基环丙烷的二乙酰氧基化反应,以中等至良好的产率在乙酸中生成相应的二乙酰氧基化产物