Stereoselective Synthesis of 1-Fluoro-<i>exo</i>,<i>exo</i>-2,6-diaryl-3,7-dioxabicyclo[3.3.0]octanes: Synthesis of (±)-1-Fluoromembrine
作者:Teerachai Punirun、Darunee Soorukram、Chutima Kuhakarn、Vichai Reutrakul、Manat Pohmakotr
DOI:10.1021/acs.joc.5b00970
日期:2015.8.21
Stereoselective synthesis of 1-fluoro-exo,exo-2,6-diaryl-3,7-dioxabicyclo[3.3.0]octanes is described. The synthetic strategy involves stereoselective fluorination of 3,4-trans-4,5-cis-3-aroyl-5-arylparaconic esters using Selectfluor to afford the corresponding fluorinated paraconic esters in good yields as a single isomer, which are subjected to reduction employing LiAlH4 or DIBALH followed by furofuran
描述了1-氟-exo,exo -2,6-二芳基-3,7-二氧杂双环[3.3.0]辛烷的立体选择性合成。合成策略涉及使用Selectfluor立体选择性地氟化3,4-反-4,5-顺-3-芳基-5-芳基对圆锥酸酯,以高收率得到相应的氟化对圆锥酸酯,以单一异构体的形式进行还原反应。的LiAlH 4或DIBALH接着酸或路易斯酸的条件下形成Furofuran型,得到了一系列1-氟的外型,外切-furofurans在中等产率。合成协议还提供了对(±)-1-氟甲基苯丙氨酸的访问。