Cross-metathesis reactions of α,β-unsaturated sulfones and sulfoxides in the presence of molybdenum and ruthenium pre-catalysts were tested. A selective metahesis reaction was achieved between functionalized terminalolefins and vinyl sulfones by using the ‘second generation’ ruthenium catalysts 1c–h while the highly active Schrock catalyst 1b was found to be functional group incompatible with vinyl
Reactions of aldehdydes with organozinc reagents derived from (E)-3-bromo- and (E)-3-iodo-1-phenylsulfonylprop-1-ene
作者:Eva M. Gallagher、D. H. Grayson
DOI:10.3998/ark.5550190.p008.741
日期:——
E)-3-Bromo-1-phenylsulfonylprop-1-ene and (E)-3-iodo-1-phenylsulfonylprop-1-ene both form allylic organozincreagents that react with aromatic aldehydes to give mainly 4-aryl-4-hydroxy1-phenylsulfonylbut-1-enes. In contrast, reactions of the same organozinc species with 2-methylpropanal or 3-methylbutanal gave mixtures of diastereoisomeric 4-hydroxy-1-phenylsulfonylalk1-enes and 4-hydroxy-3-phenylsulfonylalk-1-enes
Vinylsulfones have been efficiently synthesized by treatment of alkenes with sodium arene sulfinates using potassium iodide and sodium periodate in the presence of a catalytic amount of acetic acid at room temperature. The products are formed in high yields (87-95%) within 2.5-8 hours. vinylsulfone - alkene - arylsulfinate - synthetic methods Part 229 in the series ‘Studies on Novel Synthetic Methodologies’