Substituent-dependent asymmetric induction in the ring transformation of 2,3-dihydroimidazo[2,1-a]phthalazin-4-ium-6-olates effected by acetic and propionic anhydrides
the effect of acetic and propionic anhydrides 2,3-dihydroimidazo[2,1-a]phthalazin-4-ium-6-olates (1c-j) underwent ring transformation (1→7.8). Alternative mechanisms are applied to reason the characteristic substituent-dependent asymmetricinduction observed for the transformations of the 2-monosubstituted precursors. The structures of products were determined by IR. MS. 1H- and 13C-NMR (1D- and 2D)
在乙酸酐和丙酸酐的作用下,对2,3-二氢咪唑并[2,1- a ]酞嗪-4-鎓-6-油酸酯(1c-j)进行环转化(1→7.8 )。可应用其他机制来解释观察到的2-单取代前体转化过程中依赖于取代基的不对称特征。通过IR确定产物的结构。小姐。单晶X射线分析支持1 H和13 C-NMR(1D和2D)测量。