Concise Construction of 1‐Sulfonyl‐1H‐indoles Using Solid Calcium Carbide as a Surrogate of Gaseous Acetylene

Abstract A concise method for the construction of 1‐sulfonyl‐1 H ‐indoles by the reactions of N ‐(2‐iodoaryl)sulfonamides with calcium carbide is described. The notable features of this protocol are the use of inexpensive and easy‐to‐handle solid alkyne source as a surrogate of flammable and explosive gaseous acetylene, wide scope of substrates, high yield, and simple reaction procedure. This method can also be extended to gram scale.