Previous transition metal-catalyzed synthesis processes of δ-diketones are plagued by the high cost of the rhodium catalyst and harsh reaction conditions. Herein a low-cost, roomtemperature ruthenium catalytic method is developed based on the coupling of α-keto sulfoxoniumylides with cyclopropanols. The mild protocol features a broad substrate scope (47 examples) and a high product yield (up to 99%)
Ruthenium-Catalyzed Alkylation of Cyclopropanols with Sulfoxonium Ylides via C–C Bond Cleavage: Formation of Diverse 1,5-Diketones
作者:Mei Guan、Yong Wu、Xin Huang、Jianglian Li、Hua He、Kaichuan Yan、Ruizhi Lai、Yi Luo
DOI:10.1055/a-1588-0974
日期:2022.2
A novel ruthenium-catalyzed alkylation of cyclopropanols with sulfoxonium ylides has been developed that affords diverse 1,5-diketones with good efficiency and broad substrate scope. To illustrate the synthetic applications of the obtained 1,5-diketones, aldol and cyclization reactions have been investigated. Preliminary mechanistic studies suggest that this process involves a sequential C–C activation
Pd(0) or Pd(II)-catalyzed ring-opening reactions of benzylidene- and alkylidenecyclopropyl ketones and aldehydes
作者:Xiang-Ying Tang、Min Shi
DOI:10.1016/j.tet.2009.08.044
日期:2009.10
Pd(0) catalyzed reactions of methylenecyclopropyl carbonyl compounds afforded a convenient method for the synthesis of conjugate (E,E)-1,3-diene derivatives 2 in good to excellent yields. Moreover, we also found that Pd(II)-catalyzed reactions of methylenecyclopropyl carbonyl compounds with water gave 1,5-diketones in good to high yields via a carbene-palladium intermediate. The plausible reaction mechanisms have also been provided on the basis of control and O-18-labeling experiments. (c) 2009 Elsevier Ltd. All rights reserved.
2-(<i>N</i>-Methylanilino)-acrylnitril, ein neuer 2-C-Michael-Akzeptor