Sunlight-driven trifluoromethylation of olefinic substrates by photoredox catalysis: A green organic process
作者:Munetaka Akita、Takashi Koike
DOI:10.1016/j.crci.2015.01.013
日期:2015.7
types of catalytic photoredox processes following the reductive quenching cycle (RQC) and the oxidative quenching cycle (OQC), the discussion is focused on organic transformations based on OQC, in particular the trifluoromethylation of olefinic substrates with electrophilic trifluoromethylating reagents furnishing solvolytic addition products and substitution products. It is concluded that catalytic
Titanium tetrachloride promoted reaction of silyl ketene acetals with epoxides: a new method for the synthesis of γ-butanolides
作者:Veselin Maslak、Radomir Matović、Radomir N. Saičić
DOI:10.1016/s0040-4039(02)01070-5
日期:2002.7
A new method for the synthesis of γ-butanolides is described. The titaniumtetrachloride promoted reaction of silyl ketene acetals with epoxides, followed by acidic work-up, affords the corresponding butyrolactones in 44–83% yield.
作者:Pannan Miao、Ruining Li、Xianfeng Lin、Liangming Rao、Zhankui Sun
DOI:10.1039/d1gc00091h
日期:——
Cascade reactions are green and powerful transformations for building multiple carbon–carbon bonds in one step. Through a relay olefination and radical addition process, we were able to develop the cascade Wittig/hydroalkylation reactions induced by visible light. This metal-free radical approach features mild conditions, robustness, and excellent functionality compatibility. It allows access to saturated
Distal-Selective Hydroformylation using Scaffolding Catalysis
作者:Candice L. Joe、Thomas P. Blaisdell、Allison F. Geoghan、Kian L. Tan
DOI:10.1021/ja504247g
日期:2014.6.18
In hydroformylation, phosphorus-based directinggroups have been consistently successful at placing the aldehyde on the carbon proximal to the directinggroup. The design and synthesis of a novel catalyticdirectinggroup are reported that promotes aldehyde formation on the carbon distal relative to the directing functionality. This scaffolding ligand, which operates through a reversible covalent bond
respectively, by the sulfoxide-magnesium exchange reaction in high yields. Comparing the stability of the γ-chloromagnesio γ-lactones with that of the δ-chloromagnesio δ-lactones, the former was found to be much more stable. The reaction of these γ-chloromagnesio γ-lactones and δ-chloromagnesio δ-lactones with electrophiles and the stereochemistry of the reactions are discussed. γ-chloromagnesio γ-lactone