Catalytic Enantioselective Intermolecular Desymmetrization of 3-Substituted Oxetanes
作者:Zhaobin Wang、Zhilong Chen、Jianwei Sun
DOI:10.1002/anie.201300188
日期:2013.6.24
ring‐opening process features low catalyst loading, mild reaction conditions, broad functional group compatibility, high enantioselectivity, and the capability to generate chiral quaternarycenters. The highly functionalized desymmetrization products are versatile chiral buildingblocks in organic synthesis.
Highly Enantioselective, Hydrogen-Bond-Donor Catalyzed Additions to Oxetanes
作者:Daniel A. Strassfeld、Zachary K. Wickens、Elias Picazo、Eric N. Jacobsen
DOI:10.1021/jacs.0c03991
日期:2020.5.20
addition of trimethylsilyl bromide (TMSBr) to a broad variety of 3-substituted and 3,3-disubstituted oxetanes. The reaction provides direct and gen-eral access to synthetically valuable 1,3-bromohydrin building blocks from easily accessed achiral precursors. The products are readily elaborated both by nucleophilic substitution and through transition-metal-catalyzed cross-coupling reactions. The enantioselective
A practical route from oxetane or thietane to γ‐(thio)butyrolactone via solvated‐proton‐assisted cobalt‐catalyzed carbonylative ring expansion under syngas atmosphere has been established. A wide variety of γ‐(thio)butyrolactones can be afforded in good to excellent yields. The versatility of this method has been well demonstrated in the synthesis of intermediates towards the natural product Arctigenin
Enantioselective Oxetane Ring Opening with Chloride: Unusual Use of Wet Molecular Sieves for the Controlled Release of HCl
作者:Wen Yang、Zhaobin Wang、Jianwei Sun
DOI:10.1002/anie.201601844
日期:2016.6.6
An unprecedented enantioselectiveoxetaneopening with chloride provides access to a range of highly functionalized three‐carbon building blocks. The excellent enantiocontrol is enabled not only by a new catalyst, but also by the unusualuse of wetmolecularsieves for the controlledrelease of HCl.
Mild C–C Bond Formation via Lewis Acid Catalyzed Oxetane Ring Opening with Soft Carbon Nucleophiles
作者:Hai Huang、Tianyu Zhang、Jianwei Sun
DOI:10.1002/anie.202013062
日期:2021.2
C−C bond formation. In the presence of LiNTf2 or TBSNTf2 as catalyst, silyl ketene acetals were found to be effective nucleophiles to generate a wide range of highly oxygenated molecules, which are key substructure in natural products like polyketides. Furthermore, intramolecular oxetane opening by a styrene‐based carbon nucleophile via a Prins‐type process was also achieved with Sc(OTf)3 as catalyst