Abstract
AbstractN‐Sulfonylformamidines were produced from sulfonamides or N‐acylated sulfonamides using Vilsmeier reagent obtained in situ from N,N‐disubstituted formamides and oxalyl chloride. Optically active substrates did not racemize during the process. The efficient and mild cleavage of N‐sulfonylformamidines can be achieved with hydrazine hydrate in ethanol. The entire procedure constitutes a simple method for protecting, and deprotecting, the sulfonamide moiety.
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