Visible-Light-Mediated Alkylation of Thiophenols via Electron Donor–Acceptor Complexes Formed between Two Reactants
作者:Yi-Ping Cai、Fang-Yuan Nie、Qin-Hua Song
DOI:10.1021/acs.joc.1c01433
日期:2021.9.3
A metal-free, photocatalyst-free, photochemical system was developed for the direct alkylation of thiophenols via electrondonor–acceptor (EDA) complexes (KEDA = 145 M–1) between two reactants, N-hydroxyphthalimide esters as acceptors and thiophenol anions as donors, in the presence of a tertiary amine. The EDA complexes in the reaction system have a broad range of visible-light absorption (400–650
开发了一种无金属、无光催化剂的光化学系统,用于通过两种反应物之间的电子供体 - 受体 (EDA) 配合物 ( K EDA = 145 M –1 )直接烷基化苯硫酚,N-羟基邻苯二甲酰亚胺酯作为受体和苯硫酚阴离子作为供体,在叔胺的存在下。反应体系中的 EDA 配合物具有广泛的可见光吸收范围(400-650 nm),可以在阳光下有效触发反应。
Zn- and Cu-Catalyzed Coupling of Tertiary Alkyl Bromides and Oxalates to Forge Challenging C–O, C–S, and C–N Bonds
作者:Yuxin Gong、Zhaodong Zhu、Qun Qian、Weiqi Tong、Hegui Gong
DOI:10.1021/acs.orglett.0c04206
日期:2021.2.5
We describe here the facile construction of sterically hindered tertiary alkyl ethers and thioethers via the Zn(OTf)2-catalyzed coupling of alcohols/phenols with unactivated tertiary alkyl bromides and the Cu(OTf)2-catalyzed thiolation of unactivated tertiary alkyloxalates with thiols. The present protocol represents one of the most effective unactivated tertiary C(sp3)–heteroatom bond-forming conditions
Zinc-Mediated Palladium-Catalyzed Formation of Carbon−Sulfur Bonds
作者:Chad C. Eichman、James P. Stambuli
DOI:10.1021/jo900385d
日期:2009.5.15
aryl and alkyl thiols with aryl bromides in high yields. The addition of zinc chloride to a palladium catalyst system that reportedly failed to promote sulfide formation allows this once ineffective catalyst system to provide the sulfide product in good yield. This paper describes a high-yielding and general monodentate phosphine-ligated palladium catalyst for biaryl and alkyl aryl sulfide formation
Deprotonated Salicylaldehyde as Visible Light Photocatalyst
作者:Yan-Jun Zhuang、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.joc.0c00102
日期:2020.3.20
by the deprotonated salicylaldehyde through an energy-transfer pathway. Consequently, the C-C cleaving alkylation reactions of N-hydroxyphthalimide esters proceed smoothly in the presence of as low as 1 mol % of salicylaldehyde under the visible-light irradiation, affording desired alkylation products with up to 99% yields. Application in visible-light induced aerobic oxidation of N-alkylpyridinium
Carbon−Sulfur Bond-Forming Reductive Elimination Involving sp-, sp<sup>2</sup>-, and sp<sup>3</sup>-Hybridized Carbon. Mechanism, Steric Effects, and Electronic Effects on Sulfide Formation
作者:Grace Mann、David Baranano、John F. Hartwig、Arnold L. Rheingold、Ilia A. Guzei
DOI:10.1021/ja981428p
日期:1998.9.1
alkynyl sulfides. Reductiveeliminations forming alkenyl alkyl sulfides and aryl alkyl sulfides were the fastest. Eliminations of alkynyl alkyl sulfides were slower, and elimination of dialkyl sulfide was the slowest. Thus the relative rates for sulfide elimination as a function of the hybridization of the palladium-bound carbon follow the trend sp2 > sp ≫ sp3. Rates of reductiveelimination were faster