Figure 2.
Intermolecular Rh-catalyzed synthesis of methyleneazetidines. (A) Select substrates from the diazoester and aziridine scopes of the [3+1] ring expansion of bicyclic methyleneazetidines. (B) Chirality transfer experiment using enantiopure methyleneaziridine (S)-8a. (C) Potential mechanisms for the [3+1] ring expansion. (D) Computed reaction profile for the process involving methyl-substituted methyleneazeridine 8e and dirhodium-bound carbene 9a-Rh2.