Direct Access to Monoprotected Homoallylic 1,2-Diols via Dual Chromium/Photoredox Catalysis
作者:Felix Schäfers、Linda Quach、J. Luca Schwarz、Mar Saladrigas、Constantin G. Daniliuc、Frank Glorius
DOI:10.1021/acscatal.0c03697
日期:2020.10.16
Herein, we present a dual catalytic strategy to efficiently obtain monoprotected homoallylic 1,2-diols by coupling abundant aldehydes with simple (silyl) enol ethers, thus providing direct access to this important motif without the (super) stoichiometric use of prefunctionalized metal-allyl species. The modularity of our approach is shown by the introduction of several silyl- and alkyl-based protecting
Asymmetric Syntheses of 8-Oxabicyclo[3,2,1]octanes: A Cationic Cascade Cyclization
作者:Bin Li、Yu-Jun Zhao、Yin-Chang Lai、Teck-Peng Loh
DOI:10.1002/anie.201202699
日期:2012.8.6
High octane: A novel and practical syntheses of 8‐oxabicyclo[3.2.1]octanes using a cationic cascade cyclization reaction has been developed (see scheme; TIPS=triisopropylsilyl). The diastereomer of the cyclization product isolated depends upon whether the acetal or aldehyde substrate is used.
Re(I)-Catalyzed Hydropropargylation of Silyl Enol Ethers Utilizing Dynamic Interconversion of Vinylidene–Alkenylmetal Intermediates via 1,5-Hydride Transfer
Re(I)-catalyzed hydropropargylation reaction of silyl enol ethers was realized utilizing dynamic interconversion of vinylidene-alkenylmetal intermediates, where alkenylmetals underwent 1,5-hydridetransfer of the α-hydrogen to generate vinylidene intermediates. Furthermore, this process was found to be in an equilibrium.
A Facile Method for the Synthesis of Highly Substituted Six-Membered Rings: Mukaiyama−Aldol−Prins Cascade Reaction
作者:Hao Li、Teck-Peng Loh
DOI:10.1021/ol100937r
日期:2010.6.18
A highly efficient cascade reaction has been developed using cheap commercially available or easily accessible starting materials. It has the ability to construct highly functionalized six-membered ring with three to four stereogenic centers in high yields.
Rhodium‐Catalyzed Remote C(sp
<sup>3</sup>
)−H Borylation of Silyl Enol Ethers
作者:Jie Li、Shuanglin Qu、Wanxiang Zhao
DOI:10.1002/anie.201913281
日期:2020.2.3
rhodium-catalyzed remote C(sp3 )-H borylation of silylenolethers (SEEs, E/Z mixtures) by alkene isomerization and hydroboration is reported. The reaction exhibits mild reaction conditions and excellent functional-group tolerance. This method is compatible with an array of SEEs, including linear and branched SEEs derivedfrom aldehydes and ketones, and provides direct access to a broad range of structurally