Iodine-induced iminothiolactonization of γ,δ-unsaturated secondary thio-amides. new entry to 2-acetoamidothiophenes
作者:Hiroki Takahata、Toshiaki Suzuki、Mihoko Maruyama、Keiko Moriyama、Mayumi Mozumi、Tamotsu Takamatsu、Takao Yamazaki
DOI:10.1016/s0040-4020(01)86180-9
日期:1988.1
Iodine-induced cyclization of γ,δ-unsaturated secondary thioamides 1 proceeded regio- (5-exo-trigonal) and chemo- (sulfur-carbon bond formation) selectively, providing iminothiolactones 2, which were converted in two-step sequences (dehydroiodination and N-acetylation) into 2-acetoamidothiophenes 4. This procedure was performed in one flask to afford polysubstituted 2-aminothiophenes.
碘诱导的γ,δ-不饱和仲硫代酰胺1的环化选择性进行区域(5-exo-三角)和化学(硫-碳键形成),提供亚氨基硫代内酯2,将其转换为两步序列(脱氢碘化和(N-乙酰化)成2-乙酰氨基噻吩4。该程序在一个烧瓶中进行,得到多取代的2-氨基噻吩。