A facile and efficient visible-light-driven method has been developed to construct sulfoxides via oxidative coupling of aryldiazo sulfones with thiolsusing the O2 in air as the oxidant. This reaction could be performed at room temperature under catalyst- and additive-free conditions. The present methodology offers a mild and environmentally benign approach to obtain a library of sulfoxides in good
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.
oxidation of sulfides to sulfoxides and sulfones with H2O2 in moderate to good yields is developed. The reaction proceeds in the presence of 2 mol % of VO(acac)2 at room temperature. All sulfoxides and sulfones were detected by gas chromatography, and the molecular structures of 2-methylbenzyl 4-methylphenyl sulfone, 4-methylbenzyl 4-methylphenyl sulfone, 2-bromobenzyl 4-methylphenyl sulfone, and 4-tert-butylbenzyl
摘要 开发了一种用 H 2 O 2以中等至良好产率将硫化物氧化成亚砜和砜的直接选择性方法。反应在室温下在2 mol% VO(acac) 2 的存在下进行。所有亚砜和砜均采用气相色谱法检测,2-甲基苄基4-甲基苯基砜、4-甲基苄基4-甲基苯基砜、2-溴苄基4-甲基苯基砜和4-叔丁基苄基苄基砜的分子结构由下式测定单晶 X 射线晶体学。
Aromatic Sulfonylation. II. Attacking Species under Various Conditions.
作者:Yoshio Kohara、Michio Kobayashi、Hiroshi Minato
DOI:10.1246/bcsj.43.520
日期:1970.2
p-Toluenesulfonylation of toluene and anisole in the presence of AlCl3, SbCl5 or TiCl4 was investigated in methylene chloride, nitromethane and nitrobenzene. Substitution took place at 8.6–13.4% and 86.6–91.4% para positions for toluene in methylene chloride, but 42.0–45.7% ortho and 54.2–58.0% para isomers were obtained in nitromethane and nitrobenzene. Sulfonylation of toluene with p-CH3C6H4SO2+ ClO4− afforded 44.8–46.3% ortho and 53.7–55.2% para isomers. Partial rate factors for toluene were pf=52.5 in methylene chloride, of=12.6±0.9, pf=31.4±2.0 in nitromethane, and of=16.0±1.7, pf=38.3±4.2 with p-CH3C4H4SO2+ClO4−. A plausible mechanism is proposed, in which the attacking species is TsCl-MCln complex in methylene chloride, but it is an ion pair, ArSO2+MCl−n+1, in nitromethane and nitrobenzene.