The reactions of Wittig reagents with episulfides gave symmetrical olefins and triphenylphosphine sulfide in moderate yields. The same olefins were obtained by reactions of Wittig reagents with elemental sulfur. These reactions might proceed through thiocarbonyl intermediates, the existence of which was confirmed by Diels–Alder reactions with dienes.
Abstract Reaction of bis(trimethylsilyl)sulfide (HMDST) with aldehydes can be efficiently carried out in various ionic liquids, under CoCl2.6H2O or TfOTMF catalysis, leading to the formation of thioaldehydes, which are trapped as Diels-Alder cycloadducts. When 1,3-cycloheaxadiene was used, a stereoselective entry to the endo isomer was always obtained.
Synthesis and isolation of aryl thioaldehyde S-oxides
作者:Bianca F. Bonini、Germana Mazzanti、Paolo Zani、Gaetano Maccagnani、Gaetano Barbaro、Arturo Battaglia、Patrizia Giorgianni
DOI:10.1039/c39860000964
日期:——
(E)-Phenyl and (E)-(p-tolyl) trimethylsilyl thioketoneS-oxides can be easily and stereospecifically protodesilylated into the corresponding (Z)-aryl thioaldehydeS-oxides; these stable liquid lachrimatory compounds show good reactivity as heterodienophiles and the reaction with 1,3-dienes is surprisingly non-stereospecific.
2,4,6-Triaryl-dihydro-1,3,5-dithiazines reacted with electrophilicreagents such as p-TsOH·H2O, CF3COOH, HCl, and BF3·OEt2 under reflux in CH3CN to afford α-2,4,6-triaryl-1,3,5-trithianes and β-isomers (3a-d) in good yields. Reactions with I2 gave selectively 3a-d in high yields, while with ICl or IBr gave 3a-d and p-substituted benzylideneamine·HY.
The generation and trapping of thiobenzaldehyde and thioacetaldehyde
作者:Jack E. Baldwin、R. C. Gerald Lopez
DOI:10.1039/c39820001029
日期:——
thioacetaldehyde have been generated by thermolysis of alkyl thiosulphinates under preparatively useful conditions and trapped with aromatic and aliphatic 1,3-dienes, the adducts with anthracene being convenient and high yielding sources of such thioaldehydes; thiobenzaldehyde has been shown to undergo the ‘ene’ reaction.