作者:Masahiko Seki、Shin-ichi Yamada、Tooru Kuroda、Ritsuo Imashiro、Toshiaki Shimizu
DOI:10.1055/s-2000-8197
日期:——
A practical synthesis of 11-membered C 2-symmetric binaphthyl ketone (R)-1, a catalyst for asymmetric epoxidation, was developed. (±)-1,1'-Binaphthyl-2,2'-dicarboxylic acid [(±)-6] was efficiently resolved by (R)-(-)-1-cyclohexylethylamine to give (R)-6 in > 99% ee and in 38% yield. Condensation of the acid chloride derived from (R)-6 with 1,3-dihydroxyacetone dimer at 60-70 °C provided the desired chiral ketone (R)-1 in 61-63% yield without need for high dilution techniques.
开发了一种实用的合成方法,用于制备11员C2对称的双萘酮(R)-1,这是一种不对称环氧化反应的催化剂。通过(R)-(-)-1-环己基乙胺有效地分离了(±)-1,1'-双萘-2,2'-二羧酸[(±)-6],得到(R)-6,外消旋过量比(ee)超过99%,产率为38%。将从(R)-6衍生的酸氯与1,3-二羟基丙酮二聚体在60-70°C下缩合,获得所需的手性酮(R)-1,产率为61-63%,无需高稀释技术。