Synthesis of α-Thiooximes by Addition of Thiols to N,N-Bis(oxy)-enamines: A Comparative Study of S-, N-, and O-Nucleophiles in Michael Reaction with Nitrosoalkene Species
作者:Alexey Sukhorukov、Yana Naumovich、Aleksandr Kokuev、Sema Ioffe
DOI:10.1055/s-0036-1591973
日期:2018.6
Nucleophilic addition of thiols to N , N -bis(oxy)enamines (nitrosoalkene acetals) produce valuable α-thiooximes in a highly efficient manner. The reaction was found to be solvent-dependent, likely because of distinct mechanisms operating in nonpolar and basic solvents (involving either Bronsted acid or Lewis base catalysis). By performing a series of competition experiments, the relative reactivity
硫醇与 N,N-双(氧)烯胺(亚硝基烯烃缩醛)的亲核加成以高效的方式产生有价值的 α-硫肟。发现该反应依赖于溶剂,可能是因为在非极性和碱性溶剂(涉及布朗斯台德酸或路易斯碱催化)中运行的不同机制。通过进行一系列竞争实验,首次测定了 S-、N-和 O-亲核试剂与 N、N-双(氧)烯胺反应的相对反应性。有趣的是,发现相对亲核性高度依赖于溶剂,这允许通过使用适当的介质对这些反应进行区域选择性控制。