Stepwise Cross-Couplings of a Dibromo-γ-methylenebutenolide as an Access to Z-Configured α-Alkenyl-γ-alkylidenebutenolides. Straightforward Synthesis of the Antibiotic Lissoclinolide
Stepwise Cross-Couplings of a Dibromo-γ-methylenebutenolide as an Access to Z-Configured α-Alkenyl-γ-alkylidenebutenolides. Straightforward Synthesis of the Antibiotic Lissoclinolide
Stereoretentive Suzuki−Miyaura Coupling of Haloallenes Enables Fully Stereocontrolled Access to (−)-Peridinin
作者:Eric M. Woerly、Alan H. Cherney、Erin K. Davis、Martin D. Burke
DOI:10.1021/ja102721p
日期:2010.5.26
motif. This new reaction was harnessed to achieve the first completely stereocontrolled total synthesis of (-)-peridinin. This synthesis was accomplished using only one reaction iteratively to assemble four fully functionalized building blocks with complete stereoretention at each initial halide or boron-bearing carbon. This synthesis elevates the capacity of the iterative cross-coupling strategy to an
(E)- and (Z)-5-(Bromomethylene)furan-2(5H)-ones and (E)- and (Z)-3-(bromomethylene)isobenzofuran-1(3H)-ones have been prepared starting from commercially available maleic anhydrides and phthalic anhydrides, respectively. A debrominative decarboxylation or a bromodecarboxylation reaction is a key step in the synthesis. The furanones were investigated for their ability to interfere with microbial communication
5-(Bromoalkylidene)furan-2(5H)-ones, thiophen-2(5H)-ones, and pyrrol-2(5H)-ones are prepared in good yields by cleavage of the corresponding 2-acyl-5-methoxy heterocycles using oxalyl bromide in dichloromethane at ambient temperature. (C) 2012 Elsevier Ltd. All rights reserved.
Stepwise Cross-Couplings of a Dibromo-γ-methylenebutenolide as an Access to <i>Z</i>-Configured α-Alkenyl-γ-alkylidenebutenolides. Straightforward Synthesis of the Antibiotic Lissoclinolide
作者:Reinhard Brückner、Achim Sorg、Frederik Blank
DOI:10.1055/s-2005-868506
日期:——
The Z-isomer of α-bromo-γ-(bromomethylene)butenolide was prepared from α-angelica lactone or levulinic acid in three and four steps, respectively. Successive Stille-couplings with an unsaturated stannane, with the potential to use a different second unsaturated stannane, involved the γ-substituent first and the α-substituent thereafter. Thereby, α-alkenyl-γ-alkylidenebutenolides and their arene analogs were obtained Z-selectively.