Chemoselective Synthesis of Functionalized 2,5-Dihydro-2-thioxo-1<i>H</i>-imidazoles from 5,5-Diarylthiohydantoins and Activated Acetylenes
作者:Issa Yavari、Mohammad M. Ghanbari、Ashraf S. Shahvelayati、Maryam Ghazvini
DOI:10.1080/10426501003752179
日期:2010.11.23
Stable crystalline phosphorus ylides are obtained in excellent yields from the 1:1:1 addition reaction between 5,5-diarylthiohydantoins and dialkyl acetylenedicarboxylates in the presence of triphenylphosphine. These phosphoranes undergo a smooth intramolecular Wittig reaction followed by an electrocyclic ring opening to produce dialkyl 2-(2,5-dihydro-5,5-diaryl-2-thioxo-1H-imidazol-4-yl)but-2-enedioates