A nickel-catalyzed reductive cross coupling with phosphonium salts and allylic C(sp3)–O bond electrophiles, which granted direct construction of the C(sp2)–C(sp3) bond, is successfully developed. The protocol features broad substrate scope, high-functional-group tolerance, and heterocycle compatibility. Notably, the much more challenging reductive cross coupling with heterocyclic thiazolylphosphonium
Photoelectrochemical cross-dehydrogenative coupling of benzothiazoles with strong aliphatic C–H bonds
作者:Luca Capaldo、Lorenzo L. Quadri、Daniele Merli、Davide Ravelli
DOI:10.1039/d1cc01012c
日期:——
cross-dehydrogenative coupling of unactivated aliphatic hydrogen donors (e.g. alkanes) with benzothiazoles is reported. We used tetrabutylammonium decatungstate as the photocatalyst to activate strong C(sp3)–H bonds in the chosen substrates, while electrochemistry scavenged the extra electrons.
Copper-catalyzed three-component redox-neutral ring opening of benzothiazoles with aryl iodides and O-benzoyl hydroxylamines for the synthesis of 1-amino-N-(2-(phenylthio)phenyl)methanimine has been developed. This one-pot reaction undergoes C–S and N–O bond cleavage and new C–S and C–N bond construction. Several control experiments excluded a free radical procedure and also demonstrated the secondary
Synthesis of benzothiazoles from 2-aminobenzenethiols in the presence of a reusable polythiazolium precatalyst under atmospheric pressure of carbon dioxide
作者:Supill Chun、Sabyuk Yang、Young Keun Chung
DOI:10.1016/j.tet.2017.05.003
日期:2017.6
Synthesis of benzothiazoles from 2-aminobenzenethiols and carbondioxide was carried out using poly(3,4-dimethyl-5-vinylthiazolium) iodide as a precatalyst to in situ generation of NHCs by deprotonation. The reaction was successfully carried out under mild conditions (1 atm of CO2 and 60–70 °C) with a broad substrate scope and functional group tolerance. The precatalyst salt was recovered and reused
N-Heterocyclic Carbene Ligand-Controlled Regioselectivity for Nickel-Catalyzed Hydroarylation of Vinylarenes with Benzothiazoles
作者:Rui-Peng Li、Zheng-Wang Shen、Qin-Jia Wu、Jie Zhang、Hong-Mei Sun
DOI:10.1021/acs.orglett.9b01645
日期:2019.7.5
A facile regioselective switch for nickel-catalyzed hydroarylation of vinylarenes with benzothiazoles has been developed, which relies on the simple structural variation of novel Ni(II) complexes of the type Ni(NHC)[P(OR)3]Br2. Using magnesium turnings as the reductant, Ni(IMes)[P(OEt)3]Br2 afforded branched products, while Ni(IPr*OMe)[P(OEt)3]Br2 created steric demand to afford linear products. This