A new procedure for the reduction of α,β-unsaturated pyrrolidinones to 2H-pyrroles and 1H-pyrroles based on initial activation by N-nitrosation
作者:Alan C. Spivey、Christopher S. Frampton、Alan R. Battersby
DOI:10.1039/p19960002103
日期:——
hydride delivered from lithium triethylborohydride. The nitroso group is cleaved in a novel way using samarium(II) iodide and dehydration then generates the corresponding imine (which may tautomerise to the isomeric enamine). The reduction can be performed in the presence of esters and has proved efficient for the preparation of 2H-pyrroles (pyrrolenines) and 1H-pyrroles relevant to the study of tetrapyrrole
开发了一种新的两步法,将内酰胺半还原为环状亚胺和烯胺。Ñ -Nitrosation使用四氧化二氮配料Ñ亚硝基内酰胺,其经历化学选择性1,2-还原到Ñ由一个当量的选自锂,三乙基氢化递送的亚硝基carbinolamines。使用碘化sa(II)以新颖的方式裂解亚硝基,然后脱水生成相应的亚胺(它可能互变异构为异构的烯胺)。还原可以在酯的存在下进行,并且已证明对于制备与四吡咯生物合成有关的2 H-吡咯(吡咯啉)和1 H-吡咯是有效的。