Abstract
We have reported the acid–catalyzed cycloadditions of isocyanide with carbonyl compounds1,2) and with Schiff bases,3) in which the isocyanide component is incorporated as an imine group into the heterocyclic products. The cycloaddition of isocyanide with oxetane, four–membered cyclic ether, has also been realized with the aid of BF3.Et2o, which produces 1:1 cyclic adduct of 2–iminoterrahydrofuran.4).