Sulfonyldiazomethanes (1), as stable and safe substitutes for hazardous diazomethane, have been conveniently acylated with acyl chlorides in the presence of triethylamine in acetonitrile to give α-acylsulfonyldiazomethanes (α-diazo-β-ketosulfones, 3) in good yields. Investigation of their thermal behavior in the presence of benzyl alcohol has revealed that Wolff rearrangement occurs to give α-sulfonylacetates (4). The overall process may provide a new, safe method for the Arndt-Eistert synthesis of α-sulfonylacetates (4) from carboxylic acid chlorides.
磺酰基二氮杂
环丁烷(1)是危险的二氮杂
环丁烷的稳定而安全的替代品,在
乙腈中
三乙胺存在下,磺酰基二氮杂
环丁烷与酰基
氯发生酰化反应,可以得到α-酰基磺酰基二氮杂
环丁烷(α-二氮-β-酮砜,3),收率很高。对它们在
苯甲醇存在下的热行为研究发现,沃尔夫重排生成了 α-磺酰基
乙酸酯(4)。整个过程为从
羧酸氯化物中合成α-砜基
乙酸酯(4)提供了一种新的安全方法。