Iron-Catalyzed Cross-Coupling of Unactivated Secondary Alkyl Thio Ethers and Sulfones with Aryl Grignard Reagents
作者:Scott E. Denmark、Alexander J. Cresswell
DOI:10.1021/jo402246h
日期:2013.12.20
ed cross-coupling are described. Initial studies focused on discerning the structural and electronic features of the organosulfur substrate that enable the challenging oxidative addition to the C(sp3)–S bond. Through extensive optimization efforts, an Fe(acac)3-catalyzed cross-coupling of unactivated alkyl aryl thio ethers with aryl Grignardreagents was realized in which a nitrogen “directing group”
Cyanoborohydrides are efficient reagents in the reductive addition reactions of alkyl iodides and electron-deficient olefins. In contrast to using tinreagents, the reaction took place chemoselectively at the carbon–iodine bond but not at the carbon–bromine or carbon–chlorine bond. The reaction system was successfully applied to three-component reactions, including radical carbonylation. The rate constant
氰基硼氢化物是烷基碘化物和缺电子烯烃的还原加成反应中的有效试剂。与使用锡试剂相反,该反应在碳碘键上发生化学选择,而在碳溴或碳氯键上没有发生。该反应体系已成功应用于三组分反应,包括自由基羰基化。通过动力学竞争法,在25°C下从氰基硼氢化四丁基铵中伯烷基脱氢的速率常数估计为<1×10 4 M –1 s –1。该值比氢化三丁基锡的值小3个数量级。
Generation of magnesium carbenoids from 1-chloroalkyl phenyl sulfoxides with a Grignard reagent and applications to alkylation and olefin synthesis
作者:Tsuyoshi Satoh、Atsushi Kondo、Jun Musashi
DOI:10.1016/j.tet.2004.04.063
日期:2004.6
Treatment of 1-chloroalkyl phenyl sulfoxides with a Grignard reagent at low temperature gave magnesium carbenoids in quantitative yields. The generated magnesium carbenoids were found to be stable at lower than −60 °C for long periods of time and are reactive with Grignard reagents to give alkylated products. The reaction of the generated magnesium carbenoids with various kinds of lithium α-sulfonyl
Incubation of alkyl aryl and allyl aryl sulfides with growing cells of Corynebaoterium equi IFO 3730 gave the corresponding opticallyactivesulfoxides of high enantiomeric excess.
Divergent upgrading pathways of sulfones with primary alcohols: nickel-catalyzed α-alkylation under N<sub>2</sub> and metal-free promoted β-olefination in open air
作者:Haiping Yu、Kaiyue Fu、Guang Yang、Mengyu Liu、Peng Yang、Tao Liu
DOI:10.1039/d2cc05882k
日期:——
Coupling of sulfones and alcohols catalyzed by Ni(OAc)2/P(t-Bu)3 undergoes α-alkylation while β-olefination proceeds in the presence of a base and air.