Cyclopropyl-substituted alkenes react with complexes formed by boron trifluoride and 3-(ethylthio)propionyl fluoride and 2-(ethylthio)acetyl fluoride to give ketones containing an ethylthio group. In most cases the reaction is not accompanied by opening of the three-membered ring or rearrangements.
Cyclopropyl-substituted alkenes react with complexes formed by boron trifluoride and 3-(ethylthio)propionyl fluoride and 2-(ethylthio)acetyl fluoride to give ketones containing an ethylthio group. In most cases the reaction is not accompanied by opening of the three-membered ring or rearrangements.
Reactions of acylsulfonium salts with unsaturated hydrocarbons
作者:Valentine G Nenajdenko、Mikhail V Lebedev、Elisabeth S Balenkova
DOI:10.1016/s0040-4020(01)00897-3
日期:2001.10
The reactions of acylsulfonium salts, obtained from β-(ethylsulfanyl)propionyl fluoride and (ethylsulfanyl)acetyl fluoride, with various unsaturatedhydrocarbons proceed through the formation of six- and five-membered cyclic sulfonium salts, respectively. Succeeding cleavage of sulfonium salts by bases affords the corresponding sulfur containing unsaturated ketones.
作者:Mikhail V. Lebedev、Valentine G. Nenajdenko、Elizabeth S. Balenkova
DOI:10.1055/s-2001-18054
日期:——
A new simple and efficient way to 3-hydroxy(methoxy)thiophenes is described. The reactions of (ethylsulfanyl)acetyl fluoride/boron trifluoride (1) and 2-(ethylsulfanyl)butanoyl fluoride/boron trifluoride (6) complexes with acetylenes give rise to the 5-membered cyclic sulfonium salts (3a-f). The last ones (3e, 3f) after being refluxed with thiourea in methanol or acetonitrile are converted into 3-methoxythiophenes or 3-(2H)-thiophenones respectively. Several 3-methoxythiophenes unsubstituted in the 2-position were obtained by the reactions of 1 with acetylenes. Reactions of 6 with acetylenes allows the synthesis of 2-ethylsubsituted 3-methoxythiophenes. The method allows the synthesis of a variety of mono-, di-, tri- and tetrasubsituted thiophenes.