Synthesis ofγ-Lactones from Cycloocta-1,5-diene− Starting Materials for Natural-Product Synthesis
作者:Sandra Behr、Klaus Hegemann、Holger Schimanski、Roland Fröhlich、Günter Haufe
DOI:10.1002/ejoc.200400219
日期:2004.9
1]nonan-2-one (exo-23), respectively, under the conditions of a Baeyer−Villiger oxidation with trifluoroperacetic acid. The latter compounds were obtained by O-heterocylization of cis,cis-cycloocta-1,5-diene (1) by either reaction with peracids followed by hydrolysis and Jones oxidation or ruthenium tetraoxide oxidation, respectively. The optically active bislactone (R,R)-(−)-12 was prepared in a similar
双内酯rac-tetrahydro-2,2'-bifuranyl-5,5'-dione (rac-12) 及其非对映异构体meso-25 由endo-5-hydroxy-9-oxabicyclo[4.2.1]nonan-2 制备-one (endo-10) 和endo-6-hydroxy-9-oxabicyclo[3.3.1]nonan-2-one (endo-11) 或exo-5-hydroxy-9-oxabicyclo[4.2.1]nonan-2 -one (exo-23),分别在 Baeyer-Villiger 氧化条件下与三氟过乙酸。后一种化合物是通过顺式,顺式-环辛基-1,5-二烯 (1) 的 O-杂环化获得的,分别通过与过酸反应然后水解和琼斯氧化或四氧化钌氧化。旋光双内酯 (R,R)-(-)-12 以类似的方式由 (1S,5R,6R)-(+)-10 和 (1R,5R,6R)-(+)-11