Synthesis of 3, 4-disubstituted 2-azetidinones has been achieved following Staudinger reaction under microwave-induced conditions. The stereoselectivity of β-lactam formation depends on the nature of the solvents used in the reaction.
Bandyopadhyay, D., Yanez, M., & Banik, B. K. (2011). MICROWAVE-INDUCED STEREOSELECTIVITY OF β-LACTAM FORMATION: EFFECTS OF SOLVENTS. Heterocyclic Letters, 1, 65–67.