N. Hussain et Do. Morgan, A MILD AND EFFICIENT METHOD FOR THE FORMATION OF A KEY INTERMEDIATE IN PENEM CHEMISTRY, Tetrahedron letters, 36(25), 1995, pp. 4487-4488
A mild, rapid and efficient method for the formation of phosphoranes 2
from oxalimides 1 is described. These phosphoranes can be cyclized to
provide penems 3.