Ring enlargement of diaziridinone: Pyrazoline-forming reaction with α-metalated nitrile

Article abstract of DOI:10.1016/S0040-4039(00)98062-6

Reaction of N,N'-di-tert-butyldiaziridinone (1) with α-lithiopropionitrile or α-sodiobenzylcyanide caused ring enlargement of 1 to give functionalized five-membered heterocycles such as aminopyrazolinone and/or iminopyrazolidinone.