The first method for the preparation of isothiocyanate substituted allenes by [3,3] sigmatropic rearrangement of propargyl thiocyanates is described. These allenes undergo a variety of successive reactions such as ionic or sigmatropic isomerization, electrocyclic ring closure, cycloaddition, and electrophilic addition. Furthermore, intramolecular nucleophilic attack as well as treatment with external
Just by the introduction of isomerizable groups and successive [3,3] or [2,3] rearrangements, the diols 1 can be transformed into the new synthetic building blocks 2. The conversion often proceeds with high stereoselectivity or even stereospecificity, and in some cases in a one-pot reaction. X, Y=NHCOCCl3 , N3 , P(O)Ph2 , 4-SO2 C6 H4 Me, S(O)Ar, SCOR.