p-tolylsulfones, easily prepared frombase-catalyzed condensation of aromatic aldehydes with a variety of p-tolylsulfones, were efficiently transformed to the corresponding (E)-β-substituted aromatic olefins in a stereoselective manner through Mg-promoted reduction. The reaction may be initiated through electron transfer from Mg metal to the vinyl sulfones to give the corresponding anionic species
Preparation of 2-halogeno S-phenyl thioesters from 2-phenylsulphony -2-phenylthiooxiranes. Crystal structures of 2-phenylsulphonyloxiranes
作者:Cheryl T. Hewkin、Richard F. W. Jackson、William Clegg
DOI:10.1039/p19910003091
日期:——
the preparation of 3,3-dialkyl2-phenylsulphonyl-2-phenylthiooxiranes. The oxiranes 4 react with lithium or magnesium halides to give good yields of 2-halogeno S-phenyl thioesters 5, 6 and 7. 2-lodo S-phenyl thioesters 7 are deiodinated by further treatment with magnesium iodide. In an analogous manner, 2-bromo Smethyl thioesters 15 and a 2-bromo Se-phenyl selenoester 17b are also prepared from the