Optically pure phosphoroselenoyl chloride was reacted with racemic amines to give phosphoroselenoic amides as two diastereomeric mixtures in high yields. The diastereomeric mixtures were separated by fractional recrystallization or by chromatography. Extrusion of the selenium atom from the separated amides led to diastereomerically pure phosphoramidites. The ability of the obtained amidites to act as optically active ligands was tested in the hydrogenation of an imine.
N-Heterocyclic Pyridylmethylamines: Synthesis, Complexation, Molecular Structure, and Application to Asymmetric Suzuki–Miyaura and Oxidative Coupling Reactions
The synthesis of N,N-bidentate ligands based on a π-deficient N-heterocyclic pyridylmethylamine core is described. The preparation and characterization of the corresponding N,N-ligand–palladium complexes in solution and the solid state are illustrated. Pd complexes showed a good yield and moderate catalytic activity (up to 40% ee) in the asymmetric Suzuki–Miyaura coupling reaction, leading to methoxybinaphthyl
Synthesis of carbinoxamine <i>via</i> α-C(sp<sup>3</sup>)–H 2-pyridylation of O, S or N-containing compounds enabled by non-D–A-type super organoreductants and sulfoxide- or sulfide HAT reagents
作者:Xian-Chao Cui、Hu Zhang、Yi-Ping Wang、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1039/d2sc03504a
日期:——
anticholinergic agent carbinoxamine is an ether bearing 2-pyridyl, which has not been obtained by the existing α-photoarylation of ether. In this work, we report the discovery of a non-donor–acceptor (D–A) type organic photoreductant CBZ6 and sulfoxide/sulfide synergistically catalyzed general α-C(sp3)–H arylation of ethers, thioethers and amines. By using as low as 1 mol% of CBZ6 as a recyclable organic
叔胺 (R 3 N) 的自由基阳离子已被公认为 HAT 试剂在光化学转化中的前体。同样,带有 SH 基团的硫醇和硫代酸也被广泛用作 HAT 试剂。尽管亚砜(R 2SO) 和硫化物 (RSR) 也带有孤对电子,这些化合物几乎没有被报道为光催化中的 HAT 试剂。另一方面,已经记录了含 O 或 N 化合物的 α-C-H 4-吡啶基化,而 2-吡啶基化仍然具有挑战性。然而,抗组胺药和抗胆碱药羧甲胺是一种带有2-吡啶基的醚,目前还没有通过醚的α-光芳基化得到。在这项工作中,我们报告了非供体-受体 (D-A) 型有机光还原剂 CBZ6和亚砜/硫化物协同催化醚、硫醚和胺的一般 α-C(sp 3 )-H 芳基化的发现。通过使用低至 1 mol% 的CBZ6作为可回收的有机光还原剂和作为新型HAT试剂的亚砜或硫化物,已经完成了含O、N或S的化合物的2-或4-吡啶基化。这是含 O、N 或 S 化合物的 α-C–H
Heterogeneous Bimolecular Reduction. III. The Coreduction of Pyridine with Imines and the Preparation of Pyridylmethylamines<sup>1</sup>
作者:G. BRYANT BACHMAN、MICHAEL KARICKHOFF
DOI:10.1021/jo01093a018
日期:1959.11
Process for hydrogenation of carbonyl and iminocarbonyl compounds using ruthenium catalysts comprising tetradentate diimino-diphosphine ligands
申请人:——
公开号:US20040015017A1
公开(公告)日:2004-01-22
A process for the hydrogenation, using molecular hydrogen (H
2
), of a catalytic system, wherein the catalytic system comprises a base and a complex of formula; (II) wherein Y represents simultaneously or independently a hydrogen or halogen atom, a hydroxy group, or an alkoxy, carboxyl or other anionic radical, and N
2
P
2
is a tetradentate diimine-diphosphino ligand.