Facile synthesis of phthalidyl fused spiro thiohydantoins through silica sulfuric acid induced oxidative rearrangement of ninhydrin adducts of thioureas
作者:Subhro Mandal、Animesh Pramanik
DOI:10.1016/j.tet.2019.130817
日期:2020.1
A one-pot three-component sequential synthetic protocol produces structurally and biologically important phthalidyl fusedspiro N,N′-disubstituted thiohydantoins from readily available aromatic isothiocyanates, primary amines and ninhydrin. In this three-step synthesis while the initial two steps are catalyst-free, in the final step silica sulfuric acid (SSA) induces an oxidative rearrangement in [3