ChemInform Abstract: Transition‐Metal‐Free Synthesis of Imidazo[2, 1‐b]thiazoles and Thiazolo[3, 2‐a]benzimidazoles via an S‐Propargylation/5‐exo‐dig Cyclization/Isomerization Sequence Using Propargyl Tosylates as Substrates. Issue 16 (April 2015)