A highly efficient and enantioselective Rh-( R, R)-f-spiroPhos complex catalyzed hydrogenation of a series of unsaturated sulfones has been developed. With Rh-( R, R)-f-spiroPhos catalyst under mild conditions, not only the asymmetric hydrogenation of both the 3,3-diaryl and exocyclic α,β-unsaturated sulfones was first realized with up to 99.9% ee but also 3-alkyl-3-aryl and benzo[ b]thiophene-1,1-dioxides
full details of the synthesis and characterization of monohydride‐dichloro rhodium(III) complexes bearing chiral diphosphine ligands, such as (S )‐BINAP, (S )‐DM‐SEGPHOS, and (S )‐DTBM‐SEGPHOS, producing cationic triply chloride bridged dinuclear rhodium(III) complexes (1 a : (S )‐BINAP; 1 b : (S )‐DM‐SEGPHOS) and a neutral mononuclear monohydride‐dichloro rhodium(III) complex (1 c : (S )‐DTBM‐SEGPHOS)
Facile oxidation of electron-poor benzo[b]thiophenes to the corresponding sulfones with an aqueous solution of H2O2 and P2O5
作者:Dyeison Antonow、Teresa Marrafa、Irfaan Dawood、Tauheed Ahmed、Mohammad R. Haque、David E. Thurston、Giovanna Zinzalla
DOI:10.1039/b924333j
日期:——
A facile oxidation for the clean conversion of benzo[b]thiophenes to their corresponding sulfones is described employing an aqueous solution of H(2)O(2) and P(2)O(5); the solution can be prepared and stored on a multi-gram scale with a shelf-life of up to two weeks.
Iridium-Catalyzed Asymmetric Hydrogenation of Benzo[<i>b</i>
]thiophene 1,1-Dioxides
作者:Paolo Tosatti、Andreas Pfaltz
DOI:10.1002/anie.201701409
日期:2017.4.10
An efficient iridium‐catalyzed asymmetrichydrogenation of substituted benzothiophene 1,1‐dioxides is described. The use of iridium complexes with chiral pyridyl phosphinite ligands provides access to highly enantiomerically enriched sulfones with substituents at the 2‐ and 3‐position. Sulfones of this type are of interest as core structures of agrochemicals and pharmaceuticals. Moreover, they can
Iridium‐Catalyzed Enantioselective Hydrogenation of Indole and Benzofuran Derivatives
作者:Yao Ge、Zheng Wang、Zhaobin Han、Kuiling Ding
DOI:10.1002/chem.202002532
日期:2020.12
Enantioselectivehydrogenation of a broad spectrum of N‐, O‐, and S‐containing aromatic benzoheterocycles or nonaromatic unsaturated heterocycles has been realized by using an Ir/SpinPHOX (SpinPHOX=spiro[4,4]‐1,6‐nonadiene‐based phosphine‐oxazoline) complex as the catalyst, affording an array of the corresponding chiral benzoheterocycles (30 examples) with excellent enantioselectivities (>99 % ee in