Synthesis of trans-fused tetrahydropyrans via intramolecular cyclization of α-bromo-γ′-hydroxy ketones
作者:Yuji Mori、Keisuke Yaegashi、Hiroshi Furukawa
DOI:10.1016/s0040-4039(99)01323-4
日期:1999.10
A practical method for the synthesis of trans-fused polytetrahydropyrans using racemic cis- and trans-epoxy sulfones was developed. Four diastereoisomers, obtained by the reaction of an optically active triflate and the oxiranyl anions generated from racemic cis- and trans-epoxy sulfones, were transformed into α-bromo-γ′-hydroxy ketones, and the DBU-induced intramolecular cyclization gave tetrahydropyranones
开发了一种利用外消旋顺式和反式环氧砜合成反式聚四氢吡喃的实用方法。将旋光性三氟甲磺酸酯与外消旋的顺式和反式环氧砜生成的环氧乙烷基阴离子反应获得的四种非对映异构体转化为α-溴-γ'-羟基酮,然后DBU诱导的分子内环化反应生成四氢吡喃酮。