Total synthesis of myxol and deoxymyxol stereoisomers and their application to determining the absolute configurations of the natural products
作者:Yumiko Yamano、Miki Masumoto、Shinichi Takaichi、Akimori Wada
DOI:10.1016/j.tet.2018.02.018
日期:2018.3
total synthesis of myxol stereoisomers 1a,b and deoxymyxol (plectaniaxanthin) stereoisomers 2a,b was accomplished by Wittig reaction of (S)- and (R)-C10-phosphonium salts 8a,b bearing a silyl-protected 1,2-dihydroxy-ψ end group with C30-apocarotenals 6 and 7. The phosphonium salts 8a,b were derived from aldehydes 11a,b possessing a cyclopentylidene ketal moiety, prepared via Sharpless asymmetric epoxidation
通过带有甲硅烷基保护的1,2-的(S)-和(R)-C 10 -phosph盐8a,b的Wittig反应,完成了myxol立体异构体1a,b和deoxymyxol(plectaniaxanthin)立体异构体2a,b的总合成。具有C 30-环戊烯基6和7的二羟基-ψ端基。via盐8a,b衍生自具有环戊叉基缩酮部分的醛11a,b,其通过烯丙醇12的Sharpless不对称环氧化制备。接着是环氧乙烷环的区域选择性裂解。我们建立了使用手性柱分离立体异构体1a,b和2a,b的分析HPLC方法,从而确定了天然产物的绝对构型。HPLC分析确定了既myxol和deoxymyxol从细菌中分离具有2'小号-构型。