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.
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.
Control of up to Five Stereocenters in a Cascade Reaction: Synthesis of Highly Functionalized Five-Membered Rings
作者:Hao Li、Teck-Peng Loh
DOI:10.1021/ja801488z
日期:2008.6.1
Mukaiyama-Aldol and Prins reactions have been identified as highly efficient methods in C-C bond formation since they were discovered several decades ago. Since both reactions gave the same common intermediate, oxocarbonium, we intend to combine the two reactions into a domino process, which means the formation of multiple C-C bonds and stereogenic centers in one pot without isolation of any intermediates
自从几十年前发现 Mukaiyama-Aldol 和 Prins 反应以来,它们就被认为是形成 CC 键的高效方法。由于这两个反应都产生了相同的中间体氧碳鎓,我们打算将这两个反应组合成一个多米诺骨牌过程,这意味着在一个锅中形成多个 CC 键和立体中心,而无需分离任何中间体。我们设想涉及用路易斯酸 (TiBr4) 处理的甲硅烷基烯醇醚和缩醛的 Mukaiyama-Aldol 反应的多米诺反应将产生氧鎓中间体,在分子内 Prins 环化中被烯烃官能团捕获后,将产生环戊基环系统。
Formal β‐C−H Arylation of Aldehydes and Ketones by Cooperative Nickel and Photoredox Catalysis
作者:Kun Liu、Armido Studer
DOI:10.1002/anie.202206533
日期:2022.8
Formal β-C−H (hetero)arylation of aldehydes and ketones via their readily prepared silyl enol ethers has been achieved by dual nickel and photoredox catalysis. This reaction features broad scope and excellent functional group tolerance.