Catalytic Asymmetric Vinylogous Prins Cyclization: A Highly Diastereo- and Enantioselective Entry to Tetrahydrofurans
作者:Youwei Xie、Gui-Juan Cheng、Sunggi Lee、Philip S. J. Kaib、Walter Thiel、Benjamin List
DOI:10.1021/jacs.6b09129
日期:2016.11.9
cyclization. This reaction constitutes an efficient approach for highly diastereo- and enantioselective synthesis of tetrahydrofurans (THFs) and is catalyzed by a confined chiral imidodiphosphoric acid (IDP). Aromatic and heteroaromatic aldehydes react with various 3,5-dien-1-ols to afford 2,3-disubstituted THFs in excellent selectivity (d.r. > 20:1, e.r. up to 99:1). Aliphatic aldehydes react with similarly
Secondary stereocontrolling interactions in chiral Brønsted acid catalysis: study of a Petasis–Ferrier-type rearrangement catalyzed by chiral phosphoric acids
作者:Kyohei Kanomata、Yasunori Toda、Yukihiro Shibata、Masahiro Yamanaka、Seiji Tsuzuki、Ilya D. Gridnev、Masahiro Terada
DOI:10.1039/c4sc00611a
日期:——
Chiral phosphoric acids have emerged as promising asymmetric Brønsted acid catalysts that harness hydrogen bonding interactions as key stereocontrolling elements. A new approach to chiral phosphoric acid catalysis through ion-pairing interactions between the anionic conjugate base of the catalyst and a cationic electrophile has recently attracted attention. However, the mechanism of stereocontrol through
Lewis Acid-Catalyzed Vinyl Acetal Rearrangement of 4,5-Dihydro-1,3-dioxepines: Stereoselective Synthesis of <i>cis-</i> and <i>trans-</i>2,3-Disubstituted Tetrahydrofurans
作者:Arun K. Ghosh、Miranda R. Belcher
DOI:10.1021/acs.joc.0c00390
日期:2020.8.21
requisite substrates for the vinyl acetal rearrangement were synthesized via ring-closing olefin metathesis of bis(allyoxy)methyl derivatives using Grubbs second-generation catalyst followed by olefin isomerization using a catalytic amount of RuCl2(PPh3)3. We examined the substrate scope using substituted aromatic and aliphatic derivatives. Additionally, the rearrangement was utilized in the synthesis of a