The tosylmethylisocyanide (TOSMIC) reagent introduced by van Leusen et al. [ 1 1. van Leusen , AM ; Siderius , H. ; Hoogenboom , BE ; van Leusen , D. A new and simple synthesis of the pyrrole ring system from Michael acceptors and tosylmethylisocyanides . Tetrahedron Lett. 1972 , 52 , 5337 – 5340 . [CrossRef] View all references ] has found widespread application in organic synthesis. Of these, the synthesis of five-member heterocycles using TOSMIC is most ...