Reaction of Seleno- or Thiofenchone with Propiolic Acid: Wagner-Meerwein Rearrangement
作者:Kentaro Okuma、Hiroyuki Matsui、Yuichi Mori
DOI:10.1002/hc.21181
日期:2014.11
A reaction of selenofenchone with propiolicacid in refluxing chloroform produced 1,3-oxaselenin-6-one, which further reacted with acid to afford the ring-opened product. A reaction of 1,3-oxathiin-6-one prepared from thiofenchone with trifluoroacetic acid gave a Wagner–Meerwein rearranged product. In the presence of AlCl3, thiofenchone reacted with methyl propiolate to afford the corresponding rearranged
The reaction of di-tert-butyl selenoketone with propiolicacid gave 2H,6H-1,3-oxaselenin-6-one in 78% yield, whereas the reaction of di-tert-butyl thioketone with propiolicacid recovered starting thioketone almost quantitatively. On the other hand, the reaction of selenofenchone with propiolicacid gave 2H,6H-1,3-oxaselenin-6-one and Wagner-Meerwein rearranged product in good yields.