of slowly interconverting E−Z diastereomers of the title compounds. The scope and limitations are outlined for this reaction. The configurations E and Z that were assigned on the basis of homoallylic 1H−1H coupling and asymmetric solvent-induced shifts required that, in 13C NMR spectra, the observed γ-effects of substitutents at the imino nitrogens were deshielding, contrary to the well-known shielding
单环iminoaziridines和外切-内切个从降冰片烷衍生螺iminoaziridines的非对映体在向上的批次制备10g至培育应用如在合成的构建块。N,N'-二取代的α-卤代idine啶可从N-取代的α-卤代羧酰胺分两步轻松获得,并通过强碱(例如碱金属氢化物或叔丁醇)将1,3-脱卤化氢制得可蒸馏的油或-熔融固体,由标题化合物的E - Z非对映异构体缓慢互变组成。概述了该反应的范围和限制。配置E和Z是基于均一的1 H- 1 H偶合和不对称溶剂诱导的位移而分配的,它要求在13 C NMR光谱中,在亚氨基氮上观察到的取代基的γ效应是屏蔽的,这与孔相反所有其他类型的C N化合物中已知的屏蔽γ效应。但是,NOE NMR研究明确表明先前的分配是正确的,因此观察到的γ效应实际上会造成屏蔽作用。的范围15个ÑNMR化学位移跨越多于60ppm的。两种类型氮上取代基的β效应和γ效应均不遵循均匀的递增规律。