Determination of the absolute configuration and the first total synthesis of (−)- and (+)-linderol A
作者:Masayuki Yamashita、Takashi Shimizu、Ikuo Kawasaki、Shunsaku Ohta
DOI:10.1016/j.tetasy.2004.06.017
日期:2004.8
of (±)-linderol A 1, was acetylated and resolved by HPLC on chiral stationary phases into the respective enantiomers (−)- and (+)-3. Enantiopure (−)-2, obtained by hydrolysis of (−)-3, was treated with (−)-camphanic chloride to give the crystalline camphanate (−)-4, the absolute configuration of which was determined by X-ray crystallography. Triols (−)- and (+)-2 were converted to (−)- and (+)-1 without
外消旋三醇4-乙酰基-3,6-二羟基-6-羟基甲基-1-甲氧基-9-(1-甲基乙基)-5a,6,7,8,9,9a-六氢二苯并呋喃,(±)-2,中间体(±)-linderol A 1的总合成的乙酰化被乙酰化,并通过HPLC在手性固定相上拆分为相应的对映体(-)-和(+)- 3。将(-)- 3水解得到的对映纯(-)- 2用(-)-樟脑氯化物处理,得到结晶樟脑酸酯(-)- 4,其绝对构型通过X射线晶体学测定。三醇(-)-和(+)- 2转化为(-)-和(+)- 1根据先前报道的(±)-1合成,而不会破坏其立体异构中心。作为天然的( - ) - linderol阿1是衍生自( - ) - 2,其绝对构型阐明为5A - [R,6 - [R,9 - [R,9A小号。