The first synthesis of benzo[e]cycloalk[g]oxazocinone atropisomers via lactonization of N-mesyl- or N-arylsulfonyl-N-[2-(1-cycloalken-1-yl)-6-methylphenyl]glycines
作者:Rail R. Gataullin
DOI:10.1016/j.tet.2021.132388
日期:2021.9
The article describes an efficient access to cycloalkene-annulated benzoxazocines displaying both axial and central chiralities, via a domino halogenation-lactonization reaction of substituted glycine precursors. Upon interaction between N-[2-(1-cyclohexen-1-yl)-6-methylphenyl]-N-mesyl- or -N-arylsulfonylglycines and bromine an axially chiral mixture of (aR,R)- and (aS,S)-enantiomers of heterocycles
该文章描述了通过取代的甘氨酸前体的多米诺卤化-内酯化反应,有效获取环烯烃环化的苯并恶唑嗪显示轴和中心手性的方法。在N- [2-(1-环己烯-1-基)-6-甲基苯基] -N-甲磺酰基-或-N-芳基磺酰基甘氨酸和溴之间相互作用时,(a R , R )-和 (a S )的轴向手性混合物, S )-杂环的对映异构体与苯并[ e ]环六[ g ] [1,4] oxazocine 核心形成作为主要反应产物,它慢慢地转化为相应的混合物 (a S ,R )- 和 (a R , S )- 对映异构体。这些甘氨酸的N-甲苯磺酰基类似物与碘在相同条件下反应生成螺[4,1-苯并恶氮杂-5,1'-环己烷]结构的杂环。在用分子溴或碘处理这些甘氨酸的环戊烯基同系物N-甲苯磺酸酯后,在这两种情况下,都获得了具有苯并恶唑嗪酮骨架的化合物作为唯一的反应产物。