作者:Martha S. Morales-Ríos、Ernesto Rivera-Becerril、Pedro Joseph-Nathan
DOI:10.1016/j.tetasy.2005.06.022
日期:2005.7
A synthesis of the (3aS-cis)-(−)- and (3aR-cis)-(+)-enantiomers of debromoflustramine B 1 is reported. The synthesis involves the chromatographic separation of the corresponding (−)- and (+)-N-phenylethyl lactams 10 and 11, obtained by the reaction of racemic lactone 6 with (S)-(−)-1-phenylethylamine, followed by hydrolysis to give both enantiomers of 6 with very high enantiomeric excesses. The lactamization
所述的合成(3A小号-顺式) - ( - ) -和(3A - [R -顺式) - (+) - debromoflustramine B的对映异构体1被报告。合成包括色谱分离相应的(-)-和(+)- N-苯基乙基内酰胺10和11,方法是将外消旋内酯6与(S)-(-)-1-苯基乙胺反应,然后水解给的两种对映体6具有非常高的对映体过量。(-)- 6的内酰胺化得到(-)- 7,将其转化为(-)- 1通过用LiAlH 4还原而没有外消旋作用。光学活性的(+)- 1类似地由(+)- 6制备。绝对构型通过用(3a的已知负Cotton效应比较建立小号-顺式- ( - ) -毒扁豆碱)。