作者:Daisuke Hashizume、Hidenori Kogo、Akiko Sekine、Yuji Ohashi、Hisakazu Miyamoto、Fumio Toda
DOI:10.1039/p29960000061
日期:——
molecules of N,N-diisopropylarylglyoxylamides, 1, are converted into the corresponding β-lactams, 2, on exposure to UV light in the solid state. However, the chemical and optical yields of the photocyclization are quite different among the crystals. The crystal structures of the three positional isomers 1a–c as reactants and the photoproduct 2b derived from 1b are determined by X-ray structure analysis:
在固态下暴露于紫外光时,N,N -N-二异丙基芳基乙醛基叠氮化物1的分子被转化为相应的β-内酰胺2。但是,在晶体之间,光环化的化学和光学收率差异很大。从图1b衍生三个位置异构体1A-C作为反应物和光化产物2b的晶体结构通过X射线结构分析确定:(1A)ø -chlorophenyl- Ñ,Ñ:diisopropylglyoxylamide; (1b)中米-chlorophenyl- Ñ,Ñ -diisopropylglyoxylamide; (1c)对氯苯基-N,N-二异丙基乙醛酰胺;(2b)的3-(米氯苯基)-3-羟基- ñ -异丙基-4,4-二甲基氮杂环-2-酮。根据结构和所计算的堆积势能,讨论了反应的反应性和对映选择性。