An efficient one-pot procedure to synthesize 1,3-oxathiolane-2-alkylidene and 1,3-thiazolidine-2-alkylidene
structures is described. Anionic adducts derived from terminal alkynes and elemental
sulfur attack strained heterocycles regioselectively to afford the corresponding heterocyclic
compounds.
Key words
alkynes - epoxides - heterocycles - multicomponent reaction - sulfur - ring opening