Facile entry into the 7-oxo-4-oxo-1-azabicyclo[3.2.0]hept-2-ene ring system
Abstract
Rhodium(II) acetate-catalysed addition of ethyl diazoacetoacetate to (±)-4-acetoxyazetidin-2-one results in the formation of ethyl 7-oxo-4-oxa-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate.