New methods and reagents in organic synthesis. 19. Synthesis and rearrangement of .ALPHA.-acylsulfonyldiazomethanes (.ALPHA.-diazo-.BETA.-ketosulfones).
作者:YINGCHE KUO、TOYOHIKO AOYAMA、TAKAYUKI SHIOIRI
DOI:10.1248/cpb.30.526
日期:——
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.