Copper-catalyzed Ullmann coupling under ligand- and additive-free conditions. Part 2: S-Arylation of thiols with aryl iodides
作者:Pongchart Buranaprasertsuk、Joyce Wei Wei Chang、Warinthorn Chavasiri、Philip Wai Hong Chan
DOI:10.1016/j.tetlet.2008.01.060
日期:2008.3
S-Arylation of a wide variety of substituted aryl and aliphatic thiols with aryl halides catalyzed by copper iodide under mild ligand- and additive-free conditions (nBu4NBr, PhMe, NaOH, reflux, 22 h) is accomplished in good to excellent product yields (up to 96%).
在温和的无配体和无添加剂条件下(n Bu 4 NBr,PhMe,NaOH,回流,22 h),将各种取代的芳基和脂肪族硫醇与碘化铜催化的芳基卤化物进行S-芳基化反应产品收率(高达96%)。
Metalation reactions. IX. Dilithiation of aromatic thioethers
Direct dimetalation of aromatic thioethers gives with good yield the dilithiated species , , , , , . The first four species allowed the simultaneous introduction of an electrophile in the thiomethyl group and in the ring, while the last two species undergo disubstitution in the ring.
Bismuth based catalytic system for the asymmetricoxidation of alkyl and aryl benzyl sulfides using t-BuOOH as the oxidant has been investigated. This method affords sulfoxides with high enantioselectivities (up to 98% ee) and good yields in reasonable time. The over oxidized product namely the sulfone was not observed. The described method has wide range of applications, exhibits chemoselectivity/enantioselectivity
Metallation reactions. Part 35: A change of the regiochemistry in the metallation of (alkylthio)arenes
作者:Maria G Cabiddu、Salvatore Cabiddu、Enzo Cadoni、Stefania De Montis、Claudia Fattuoni、Stefana Melis
DOI:10.1016/j.tet.2004.02.069
日期:2004.4
The metallationreaction of bromo(alkylthio)benzenes is described. The results show the complementarity of these reactions with the metal–hydrogen exchange reaction. In fact, monometallation of bromo(methylthio)benzenes afforded products substituted in para or meta or ortho to the thioethereal function while bimetallation led to αS,para, αS,meta and αS,ortho disubstituted products. Analogously, the