143880-86-8Relevant articles and documents
A high-throughput screening approach for the determination of additive effects in organozinc addition reactions to aldehydes
Rudolph, Jens,Lormann, Matthias,Bolm, Carsten,Dahmen, Stefan
, p. 1361 - 1368 (2005)
The effects of additives in phenylzinc addition reactions to an aldehyde have been studied using an automated high-throughput screening approach. With 2-bromobenzaldehyde as test substrate and N,N-dibutylnorephedrine (dbne) as chiral ligand, an improvement of 20% ee over the catalyzed reaction in the absence of the additive was observed. The described results enable a novel access towards chiral diarylmethanols using commercially available substrates, reagents and ligands as well as fast, automated techniques.
Isosterically designed chiral catalysts: Rationale, optimization and their application in enantioselective nucleophilic addition to aldehydes
Gao, En,Li, Qiao,Duan, Lili,Li, Lin,Li, Yue-Ming
supporting information, (2020/10/20)
Proline-based N,N′-dioxide ligands were designed on the basis of isosteric approach, and were successfully applied in enantioselective nucleophilic addition to aldehydes. In the presence of 10 mol% of chiral ligand 1b, enantioselective addition of diethylzinc to aldehydes provided the corresponding secondary alcohols in up to 90% isolated yield and up to 99% ee. Similarly, using 3e as chiral ligand, enantioselective arylation and alkynylation of aldehydes also proceeded readily, leading to the desired chiral alcohols in up to 92% isolated yield at 99% ee and 80% isolated yields and up to 84% ee, respectively. The current work would shed light on expanding the structure diversity in the design of chiral ligands and chiral catalysts.
Asymmetric hydrogenation method of di (hetero) aryl ketone compound
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Paragraph 0042-0044; 0047-0051; 0063-0067, (2020/12/08)
The invention belongs to the technical field of chemical synthesis preparation, relates to asymmetric catalysis of compounds, and particularly relates to an asymmetric hydrogenation method of a di (hetero) aryl ketone compound. The asymmetric hydrogenatio
P-chirogenic Trost ligands mediated asymmetric hydrogenation of simple ketones
Du, Peng,Liu, Yan-Lan,Lu, Xiao-Bing
supporting information, (2020/09/22)
Herein, we report a highly active catalyst system consisting of (Rc,Rc,Rp,Rp)-P-chirogenic Trost ligand and [Ru(C6H6)Cl2]2 for asymmetric hydrogenation of simple ketones, affording the corresponding optically active alcohols in moderate enantioselectivity. A synergetic effect between P- and C-chirogenic centers of the P-chirogenic Trost ligands was observed in this asymmetric hydrogenation process.