Efficient and Easy One‐Pot Synthesis of New 3,5‐Dioxo‐thiazolo[2,3‐a] pyrimidine‐6‐carbonitrile and 4,6‐Dioxo‐pyrimido[2,1‐b][1,3]thiazine‐7‐carbonitrile Derivatives

An easy, fast, and cheap way for the synthesis of the new 3,5‐dioxo‐thiazolo[2,3‐a] pyrimidine‐6‐carbonitriles and 4,6‐dioxo‐pyrimido[2,1‐b][1,3]thiazine‐7‐carbonitriles using epoxides α‐functionalized.