A regio- and stereoselective thiocyanate addition to ynones is achieved using KSCN in AcOH at 70 °C. The reaction is extendable to ynals, ynesulfones, ynoic acids and ynoates. Adducts from ynones were readily transformed into thiazine-2-thione derivatives under slightly modified reaction conditions. In contrast, thiocyanated adducts from ynamides underwent an in situ decyanative amido cyclization towards
Synthesis of 2-Nitrothiophenes <i>via</i>
Tandem Henry Reaction and Nucleophilic Substitution on Sulfur from β-Thiocyanatopropenals
作者:Lin Rong、Yingxia Shen、Guoxi Xiong、Yuefa Gong
DOI:10.1002/jhet.3446
日期:2019.2
A new synthetic route of 2‐nitrothiophenes was described through a tetra‐n‐butylammonium fluoride‐promoted or diisopropylethylamine‐promoted tandem Henry reaction and nucleophilicsubstitution of nitromethane with 3‐thiocyanatopropenals, which were conveniently prepared by the replacement reaction of 3‐chloropropenals with potassium thiocyanate under a mild acidic condition.