Synthesis of 9-Substituted-1,8-Dioxooctahydroxanthenes by an Efficient Iodine-Catalyzed Cyclization
作者:Liliana E. Luna、Raquel M. Cravero、Ricardo Faccio、Helena Pardo、Álvaro W. Mombrú、Gustavo Seoane
DOI:10.1002/ejoc.200801233
日期:2009.6
New 1,8-dioxooctahydroxanthenes with substituents in the 2-, 3-, and 9-positions were obtained by cyclization with iodine from tandem Michael/Michael adducts. The X-ray molecular structure of the methyl 2-(1,8-dioxo-2,3,4,5,6,7,8,9-octahydro-1H-xanthen-9-yl)acetate (3a) was solved and shows the parallel laminae packing of these molecules. Furthermore, we reported the structure of intermediate 4 isolated
新的 1,8-dioxooctahydroxanthenes 在 2-、3-和 9-位具有取代基是通过与来自串联迈克尔/迈克尔加合物的碘环化获得的。解析了 2-(1,8-dioxo-2,3,4,5,6,7,8,9-octahydro-1H-xanthen-9-yl)acetate (3a) 的 X 射线分子结构并显示了这些分子的平行薄片堆积。此外,我们报告了从该反应中分离出的中间体 4 的结构。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)