Nickel-Mediated Inter- and Intramolecular C–S Coupling of Thiols and Thioacetates with Aryl Iodides at Room Temperature
摘要:
A Ni(0)-catalyzed intermolecular cross-coupling of various functionalized thiols and aryl Iodides has been developed and successfully extended to less explored intramolecular versions, where thioacetates could also be utilized as the strategic surrogate. Air-stable precatalysts, very mild conditions, and an easy protocol allow rapid access to medicinally useful aryl thioethers, as demonstrated in the facile synthesis of (+/-)-chuangxinmycin as a key step.
Electrochemical Thiolation and Borylation of Arylazo Sulfones with Thiols and B
<sub>2</sub>
pin
<sub>2</sub>
作者:Rongkang Wang、Fangming Chen、Lvqi Jiang、Wenbin Yi
DOI:10.1002/adsc.202001518
日期:2021.3.29
arylazo sulfones were used as radical precursors for carbon‐heteroatom bond formation under electrochemical conditions. Moreover, the scalability of this approach was evaluated by performing the electrochemical thiolation and borylation of arylazo sulfones with thiols and B2pin2 on a gram scale. This protocol not only avoided the use of stoichiometric oxidants, metal catalysts, activating agents and
An aerobic metal-free, visible-light-induced regioselective thiolation of phenols with thiophenols is reported. The cross-coupling protocol exhibits great functional group tolerance and high regioselectivity. Mechanistic studies reveal that the disulfide radical cation plays a crucial role in the visible-light catalysis of aerobic thiolation. Simply controlling the equivalent ratio of substrates enables
Coupling of thiols and aromatic halides promoted by diboron derived super electron donors
作者:Mario Franco、Emily L. Vargas、Mariola Tortosa、M. Belén Cid
DOI:10.1039/d1cc05294b
日期:——
We have proven that pyridine–boryl complexes can be used as superelectron donors to promote the coupling of thiols and aromatic halides through a SRN1 mechanism. The reaction is efficient for a broad substrate scope, tolerating heterocycles including pyridines, enolizable or reducible functional groups. The method has been applied to intermediates in drug synthesis as well as interesting functionalized
我们已经证明,吡啶-硼基复合物可用作超电子供体,通过 S RN 1 机制促进硫醇和芳族卤化物的偶联。该反应适用于广泛的底物范围,可耐受杂环,包括吡啶、可烯醇化或可还原的官能团。该方法已通过受控和连续的分子内电子转移过程应用于药物合成中的中间体以及有趣的功能化聚硫醚。
Iodine(III) Enabled Dehydrogenative Aryl C−S Coupling by in situ Generated Sulfenium Ion
作者:Khokan Choudhuri、Saikat Maiti、Prasenjit Mal
DOI:10.1002/adsc.201801510
日期:2019.3.5
Due to the normal polarity preferences, arenes form stable complexes with thiols through S−H⋅⋅⋅π interaction and direct dehydrogenative aryl C−S coupling is usually restricted. We report here an umpolung based one pot and direct C−S coupling approach under metal free and mild condition. Electrophile sulfenium ions were generated in situ from thiols using iodine(III) reagent PhI(OAc)2 (PIDA) and subsequently
Cross-Coupling of Chloro(hetero)arenes with Thiolates Employing a Ni(0)-Precatalyst
作者:Paul H. Gehrtz、Valentin Geiger、Tanno Schmidt、Laura Sršan、Ivana Fleischer
DOI:10.1021/acs.orglett.8b03476
日期:2019.1.4
aryl chlorides and in situ generated aliphatic and aromatic thiolates is described. The employed on-cycle, air-stable defined Ni precatalysts allow for transformation of a broad scope of substrates. A variety of functional groups and heterocyclic motifs as well as structurally varied thiols are tolerated at unprecedented moderate catalyst loadings and reaction temperatures. Depending on reaction conditions