N-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
N-磺酰基
甲脒由磺
酰胺或N-酰化磺
酰胺使用从
N,N-二取代甲
酰胺和
草酰氯原位获得的Vilsmeier试剂制备。光学活性底物在该过程中没有外消旋。N-磺酰基
甲脒的有效和温和裂解可以通过
水合
肼在
乙醇中实现。整个过程构成了一种简单的方法来保护和去保护磺
酰胺部分。