Enantioselective Desymmetrization of 2-Aryl-1,3-propanediols by Direct <i>O</i>-Alkylation with a Rationally Designed Chiral Hemiboronic Acid Catalyst That Mitigates Substrate Conformational Poisoning
作者:Carl D. Estrada、Hwee Ting Ang、Kim-Marie Vetter、Ashley A. Ponich、Dennis G. Hall
DOI:10.1021/jacs.1c00759
日期:2021.3.24
operationally simple, ambient conditions. Nucleophilic activation and discrimination of the enantiotopic hydroxy groups on the diol substrate occurs via a defined chairlike six-membered anionic complex with the hemiboronic heterocycle. The optimal binaphthyl-based catalyst 1g features a large aryloxytrityl group to effectively shield one of the two prochiral hydroxy groups on the diol complex, whereas
Selective Catalytic sp<sup>3</sup> C–O Bond Cleavage with C–N Bond Formation in 3-Alkoxy-1-propanols
作者:Cheng Chen、Soon Hyeok Hong
DOI:10.1021/ol3009842
日期:2012.6.15
The ruthenium catalyzed selective sp(3) C-O cleavage with amide formation was reported in reactions of 3-alkoxy-1-propanol derivatives and amines. The cleavage only occurs at the C3-O position even with 3-benzyloxy-1-propanol. Based on the experimental results, O-bound and C-bound Ru enolate complexes were proposed as key intermediates for the unique selective sp(3) C-O bond cleavage in 3-alkoxy-1-propanols.