Abstract Propargyl isothiocyanates 3 and buta-2, 3-dienyl isothiocyanates 20 were prepared conventionally from amines and thiophosgene, or by a new, one-pot procedure using nucleophilic substitution to generate azides, which in turn served as the starting materials for a Staudinger reaction, followed by treatment of the resulting iminophosphoranes or iminophosphates with CS 2. Equilibration, through a [3, 3] sigmatropic rearrangement, of 3 ...
