A convenient route to 1-(2-oxiranyl)-1,4-diketones and their application to the synthesis of endo-brevicomin, endo-isobrevicomin, frontalin and related compounds via alkylated 6,8-dioxabicyclo[3.2.1]octan-2-ones
作者:Vladimir I Tyvorskii、Dmitry A Astashko、Oleg G Kulinkovich
DOI:10.1016/j.tet.2003.12.027
日期:2004.2
ethyl 4-oxoalkanoates via the oxidation of the intermediate 1,2-dialkylcyclopropanols having a protected carbonyl group in an aliphatic chain. Intramolecular acetalization of these epoxy dicarbonyl compounds gave alkylated 6,8-dioxabicyclo[3.2.1]octan-2-ones in good yields. The latter were found suitable to be precursors for (±)-endo-brevicomin and its 2-hydroxy derivative, as well as (±)-endo-isobrevicomin
由4-氧代链烷酸乙酯的乙缩醛通过氧化在脂肪族链中具有被保护的羰基的中间体1,2-二烷基环丙醇制备1-(2-氧代芳基)-1,4-烷二酮。这些环氧二羰基化合物的分子内缩醛化以良好的收率得到烷基化的6,8-二氧杂双环[3.2.1]辛烷-2-酮。发现后者适合作为(±)-内-brevicomin及其2-羟基衍生物以及(±)-内-异brevicomin和(±)-额叶青素的前体。