Extremely facile ligand-exchange and disproportionation reactions of diaryl sulfoxides, selenoxides, and triarylphosphine oxides with organolithium and Grignard reagents
摘要:
Diaryl sulfoxides undergo unusually rapid ligand-exchange reaction upon treatment with organolithium reagents at -95-degrees-C. Optically pure phenyl p-tolyl sulfoxide (4b) reacted with organolithium reagents at the range from -20 to -95-degrees-C to give facile ligand-exchange and disproportionation products, i.e., diphenyl sulfoxide (7), recovered 4b, and di-p-tolyl sulfoxide (8) in a statistical ratio of 1:2:1 in quantitative yields, and the recovered 4b was completely racemized. This facile ligand exchange was observed in the similar reactions using only diaryl selenoxides and triarylphosphine oxides. The reactions of O-18-labeled phenyl p-tolyl sulfoxide (4c) with organolithium reagents gave products in a statistical ratio without O-18 scrambling, indicating that only the C-S bond cleavage took place under low temperature. It is suggested that the ligand exchange reactions occur by the nucleophilic attack by organolithium reagent at the sulfinyl sulfur atom, giving sigma-sulfurane as an intermediate that collapses rapidly. These results suggest that the treatment of arylic sulfoxides, selenoxides, and phosphine oxides with strong bases should be effected with caution.
Aryl Sulfoxides via Palladium-Catalyzed Arylation of Sulfenate Anions
作者:Guillaume Maitro、Sophie Vogel、Guillaume Prestat、David Madec、Giovanni Poli
DOI:10.1021/ol062315a
日期:2006.12.1
[Structure: see text] Palladium-catalyzedarylation of sulfenate anions generated from beta-sulfinyl esters can take place under biphasic conditions. This hitherto unknown reaction provides a simple, mild, and efficient route to aryl sulfoxides in good yields. The development of a new pseudo-domino type I procedure involving a sulfinylation followed by a Mirozoki-Heck coupling is also described.
Palladium-Catalyzed Sulfinylation of Aryl- and Alkenylborons with Sulfinate Esters
作者:Minori Suzuki、Kazuya Kanemoto、Yu Nakamura、Takamitsu Hosoya、Suguru Yoshida
DOI:10.1021/acs.orglett.1c01292
日期:2021.5.7
An efficient, direct sulfinylation of organoborons catalyzed by palladium is disclosed. Treatment of organoborons and sulfinate esters in the presence of a palladium precatalyst provided a broad range of sulfoxides. Various organosulfur compounds having oxidizable functional groups were successfully prepared through the sulfoxide synthesis.
Aryl Sulfoxides from Allyl Sulfoxides via [2,3]-Sigmatropic Rearrangement and Domino Pd-Catalyzed Generation/Arylation of Sulfenate Anions
作者:Elise Bernoud、Gaëtan Le Duc、Xavier Bantreil、Guillaume Prestat、David Madec、Giovanni Poli
DOI:10.1021/ol902620t
日期:2010.1.15
Allylic sulfoxides, via [2,3]-sigmatropic rearrangement and oxidative addition of the resulting allylic sulfenate esters to Pd(0), are found to be excellent precursors of sulfenate anions. This hitherto unknown reactivity is applied in a new Pd(0)-catalyzed domino sequence involving sulfenate anion generation followed by arylation to afford aryl sulfoxides.
A metal-free method for formal β-arylation/heteroarylation of ketones through efficient cyclopropanol ring-opening cross-couplings with aryl sulfoxides at room temperature has been developed. This protocol shows a broad substrate scope and promising scalability. In addition, the utility of the β-arylated ketones is further demonstrated through a variety of postcoupling transformations and synthetic
Direct S-Arylation of Unactivated Arylsulfoxides Using [Pd(IPr*)(cin)Cl]
作者:Frédéric Izquierdo、Anthony Chartoire、Steven P. Nolan
DOI:10.1021/cs400533e
日期:2013.10.4
The direct S-arylation of unactivated arylsulfoxides catalyzed by [Pd(IPr*)(cin)Cl] is described. Several arylmethylsulfoxides were coupled to various aryl halides in moderate to good yields (17 examples, 34-85%). Scope, limitations, and reaction mechanism are discussed.