PREPARATION OF 2-SULFONYL-1,2,3-TRIAZOLES BY BASE-PROMOTED 1,2-REARRANGEMENT OF A SULFONYL GROUP

1,2-Rearrangement of a sulfonyl group occurs on treatment of 1-sulfony1-1,2,3-triazoles with a catalytic amount of 4-dimethylaminopyridine (DMAP) in acetonitrile to give an equilibrium mixture of 1-sulfonyl- and 2-sulfonyl derivatives, with considerable predominance of the latter. Subsequent acidic treatment of the mixture caused selective hydrolysis of the 1-sulfonyl derivative, which led to the isolation of the 2-sulfony1-1,2,3-triazole in good total yield in a pure form.