Syntheses of (±)- and (+)-Sorgolactone, the Germination Stimulant fromSorghum bicolor
作者:Junichi Matsui、Masahiko Bando、Masaru Kido、Yasutomo Takeuchi、Kenji Mori
DOI:10.1002/(sici)1099-0690(199909)1999:9<2183::aid-ejoc2183>3.0.co;2-4
日期:1999.9
Syntheses of (±)-2a, the racemate of the structure proposed for sorgolactone, and its three racemic stereoisomers have been accomplished with confirmation of the stereostructures of the intermediate (±)-10 and the final product (±)-2a by X-ray analysis. Its optically active form, (3aR,8S,8bS,2′R)-(+)-2a, has also been prepared from (S)-(–)-citronellal by employing radical cyclization of 18 to 19 as
(±)-2a 是山梨内酯结构的外消旋体及其三种外消旋立体异构体的合成,中间体 (±)-10 和最终产物 (±)-2a 的立体结构已通过 X- 确认射线分析。其旋光形式 (3aR,8S,8bS,2'R)-(+)-2a 也由 (S)-(-)-香茅醛通过采用 18 至 19 的自由基环化作为关键步骤制备。将合成产品的光谱特性与天然山梨内酯的光谱特性进行比较。使用三叶草 (Orobanche minor) 种子的生物测定表明,所有立体异构体都强烈刺激它们的发芽。