Reaction of 1,3-Oxathiolium Salts with Three Types of Ring Expansion Reagents on a Nitrogen Atom
The ring expansion reactions of 1,3-oxathiolium salts (1) using NaN3 and an I2-aq NH3 system resulted exclusively in the formatiom of 1,4,2-oxathiazines (3) by incorporation of a nitrogen atom into the C-O bond in 1.On the other hand, the reaction of 1 wi