A facile synthesis of some pyrazolo[1,5-b] -1,2,4-benzothiadiazepin 5(4H)ones 10,10-dioxides. A new ring system

Isopropyl-2-chlorosulfonylbenzoate was treated with some 3(5)aminopyrazoles. A new ring system, pyrazolo[1,5-b]-1,2,4-benzothiadiazepin-5(4H)one 10,10-dioxide, was directly obtained.