Herein we reported an efficient palladium-catalyzed enantioselective arylation of both alkyl and aryl sulfenate anions to deliver various chiral sulfoxides in good yields (up to 98%) with excellent enantioselectivities (up to 99% ee) by the use of our developed chiral O,P-ligands (PC-Phos). PC-Phos are easily prepared in shortsteps from inexpensive commercially available starting materials. The single-crystal
Palladium-Catalyzed Direct Arylation of Methyl Sulfoxides with Aryl Halides
作者:Tiezheng Jia、Ana Bellomo、Kawtar EL Baina、Spencer D. Dreher、Patrick J. Walsh
DOI:10.1021/ja4009776
日期:2013.3.13
The palladium-catalyzed α-arylation of unactivated sulfoxides has been developed. The weakly acidic α-protons of sulfoxides are reversibly deprotonated by LiOtBu, and a palladium phosphine complex facilitates the arylation. A variety of aryl methyl sulfoxides were coupled with arylbromides. More challenging coupling partners, such as alkyl methyl sulfoxides (including dimethyl sulfoxide) and aryl chlorides
Palladium-Catalyzed Double CH Activation Directed by Sulfoxides in the Synthesis of Dibenzothiophenes
作者:Rajarshi Samanta、Andrey P. Antonchick
DOI:10.1002/anie.201100775
日期:2011.5.23
SO shows where to go: A novel double CH activation of aromatic compounds with a sulfoxide as a directing group results in the highly regioselective synthesis of polysubstituted dibenzothiophenes (see scheme). The reaction cascade consists of palladium‐catalyzed double CH activation and a Pummerer rearrangement followed by palladium‐catalyzedCS bond formation.