A copper-catalyzedcross-dehydrogenativeC–H/N–H coupling has been devised to access a series of N-arylated sulfoximines in high yield from 8-aminoquinoline-derived benzamides and sulfoximines. The reaction is scalable, and mechanistic studies favor the involvement of an organometallic pathway, where C–H bond cleavage is presumed to be the kinetically relevant step. The utility of sulfoximine-coupled
Silver-Catalyzed C(sp3)-H Sulfonylation for the Synthesis of Benzyl Sulfones Using Toluene Derivatives and α-Amino Acid Sulfonamides
作者:Kyalo Stephen Kanyiva、Kanako Uchida、Takanori Shibata
DOI:10.1246/bcsj.20200393
日期:2021.4.15
We describe a simple and practical protocol for the synthesis of benzyl sulfones using readily available toluene derivatives and α-aminoacid sulfonamides. The reaction proceeds to afford a broad range of benzyl sulfones in moderate to high yields under silver catalysis. The mechanism possibly involves a Minisci-type formation of α-aminoalkyl radical, homolytic cleavage of a N-S bond to generate a
Reusable BNPs-SiO<sub>2</sub>
@(CH<sub>2</sub>
)<sub>3</sub>
NHSO<sub>3</sub>
H-catalysed selective oxidation of sulfides to sulfones
作者:Kiumars Bahrami、Minoo Khodamorady
DOI:10.1002/aoc.4553
日期:2018.12
(BNPs‐SiO2@(CH2)3NHSO3H) was found to be an efficient heterogeneous nanocatalyst for the selective oxidation of sulfides to sulfones in the presence of H2O2. Excellent yields, easy and quick isolation of products, short reaction times and excellent selectivity are the main advantages of this method. The catalyst was characterized using Fourier transform infrared spectroscopy, energy‐dispersive X‐ray analysis, X‐ray
Sulfone Group as a Versatile and Removable Directing Group for Asymmetric Transfer Hydrogenation of Ketones
作者:Vijyesh K. Vyas、Guy J. Clarkson、Martin Wills
DOI:10.1002/anie.202004658
日期:2020.8.17
The sulfone functional group has a strong capacity to direct the asymmetrictransferhydrogenation (ATH) of ketones in the presence of [(arene)Ru(TsDPEN)H] complexes by adopting a position distal to the η6‐arene ring. This preference provides a means for the prediction of the sense of asymmetric reduction. The sulfone group also facilitates the formation of a range of reduction substrates, and its
Ni-catalyzed non-activated C–S bond cleavage at ambient temperature for the synthesis of sulfur-containing polycyclic compounds
作者:Takanori Shibata、Ayato Sekine、Mika Akino、Mamoru Ito
DOI:10.1039/d1cc03226g
日期:——
tetracyclic compounds at ambient temperature. The transformation was initiated by non-activated sp2 C–S bond cleavage along with consecutive alkyne insertions. A double intramolecular reaction of a tetrayne and an intermolecular reaction of monoynes were also available, and the corresponding polycyclic compounds were obtained. Moreover, the obtained cycloadduct showed photo-catalytic activity in benzylic