Some new 5‐methoxy/ethoxy‐2,3‐[2′‐(3′′‐chloro‐2′′‐oxo‐4′′‐substituted‐aryl‐1′′‐azetidinyl)‐1′,3′,4′‐thiadiazino]indoles 13–20 and 5‐methoxy/ethoxy‐2,3‐[2′‐(2′′‐substituted‐aryl‐4′′‐oxo‐1′′,3′′‐thiazolidin‐3′′‐yl)‐1′,3′,4′‐thiadiazino]indoles 21–28 have been synthesized from 5‐methoxy/ethoxy‐2,3‐[2′‐(substituted‐benzylidinylimino)‐1′,3′,4′‐thiadiazino]indoles 5–12. These newly synthesized compounds