An efficient ligand-free C−S cross-coupling of aryl halides with aromatic/alkyl thiols has been developed using a catalytic amount of nanocrystalline indium oxide as a recyclable catalyst with KOH as the base in DMSO at 135 °C. A variety of aryl sulfides can be synthesized in excellent yields utilizing this protocol.
A recyclable iron/graphite (Fe/Cg) catalyst for the efficientC-S cross-coupling of various iodoarenes with aromatic/ aliphatic thiols has been developed under ligand-free conditions (26 examples, up to 99% yield). The catalyst can be easily recovered and recycled up to seven cycles without loss of activity.
Incubation of alkyl aryl and allyl aryl sulfides with growing cells of Corynebaoterium equi IFO 3730 gave the corresponding opticallyactivesulfoxides of high enantiomeric excess.
Indium-catalyzed C-S cross-coupling of aromatic and alkane thiols with aryl halides proceeds smoothly in the presence of In(OTf)(3) (10 mol %), TMEDA (20 mol %), and KOH as a base in DMSO at 135 degrees C. When this protocol was utilized, a variety of thiols could be cross-coupled with aryl halides to afford the corresponding aryl sulfides in good to excellent yields.
Ohta, Hiromichi; Okamoto, Yasushi; Tsuchihashi, Gen-ichi, Agricultural and Biological Chemistry, 1985, vol. 49, # 3, p. 671 - 676