Convergent Synthesis and Structural Confirmation of Phellodonin and Sarcodonin ε
作者:Ippei Usui、David W. Lin、Takeshi Masuda、Phil S. Baran
DOI:10.1021/ol400709f
日期:2013.5.3
The first synthesis of members of the sarcodonin family, phellodonin and sarcodonin epsilon, is reported herein. This verifies that the unprecedented and seemingly unstable N,N-dioxide-containing benzodioxazine framework can be constructed in the laboratory and lends further support to the proposed structures. The key step in the synthesis involves a biomimetic hetero-Diels-Alder reaction between a pyrazine N-oxide and an ortho-quinone.
An Approach to 3,6-Disubstituted 2,5-Dioxybenzoquinones via Two Sequential Suzuki Couplings. Three-Step Synthesis of Leucomelone
作者:Xianwen Gan、Wei Jiang、Wei Wang、Lihong Hu
DOI:10.1021/ol802645f
日期:2009.2.5
Two sequential Suzuki coupling reactions have been developed for efficient synthesis of synthetically and biologically important 3,6-disubstituted 2,5-dioxybenzoquinone architectures in a highly chemoselective controlled manner. The method serves as a key step in the total synthesis of leucomelone in three steps and in 61% overall yield.