Disulfide-based metal-free α-sulfanylation of ketones
作者:Andrea F. Vaquer、Angelo Frongia、Francesco Secci、Enrica Tuveri
DOI:10.1039/c5ra17913k
日期:——
An eco-friendly methodology for the direct α-sulfanylation of ketones has been developed by using diaryl disulfides as sulfanyl source affording ketosulfides in good to excellent yields and high selectivity.
A Ring Expansion of Cyclic Ketones to α-Phenylthio Ketones via Lewis Acid Mediated Denitration
作者:Sunggak Kim、Jung Ho Park
DOI:10.1246/cl.1988.1323
日期:1988.8.5
The adducts of cyclicketones with the lithium derivative of (phenylthio)nitromethane are readily rearranged to the ring expanded α-phenylthio ketones via aluminum chloride mediated denitration.
Efficient and Stereoselective Synthesis of Bicyclo[3.2.1]octan-8-ones: Synthesis and Palladium-Catalyzed Isomerization of Functionalized 2-Vinyl-2,3,3a,4,5,6-hexahydro-2,3-benzofurans
diastereoselective formation of 2-vinyl-2,3,3a,4,5,6-hexahydro-2,3-benzofurans. The products could be efficiently transformed into functionalized bicyclo[3.2.1]octan-8-ones by a palladium-catalyzed rearrangement reaction. In case of sulfone derivatives, this rearrangement proceeds with high stereospecifity to give exclusively the endo-configured diastereomers. The bicyclo[3.2.1]octane skeleton is present
A facile and efficient protocol for the α-benzoyloxylation of β-keto sulfides is presented. This methodology provides a step-economical, mild and practical access to highly functionalized α-O-benzoyloxy substituted β-keto sulfides, including those with quaternary carbons, which are not easily obtained through currently available methods.
Conformationally Biased Ketones React Diastereoselectively with Allylmagnesium Halides
作者:Nicole D. Bartolo、Krystyna M. Demkiw、Jacquelyne A. Read、Elizabeth M. Valentín、Yingying Yang、Alexandra M. Dillon、Chunhua T. Hu、Michael D. Ward、K. A. Woerpel
DOI:10.1021/acs.joc.1c02844
日期:2022.3.4
The addition of the highly reactive reagent allylmagnesium halide to α-substituted acyclic chiral ketones proceeded with high stereoselectivity. The stereoselectivity cannot be analyzed by conventional stereochemical models because these reactions do not conform to the requirements of those models. Instead, the stereoselectivity arises from the approach of the nucleophile to the most accessible diastereofaces
高反应性试剂烯丙基卤化镁与α-取代的无环手性酮的加成具有高立体选择性。立体选择性无法通过常规立体化学模型进行分析,因为这些反应不符合这些模型的要求。相反,立体选择性是由于亲核试剂接近酮的最低能量构象的最容易接近的非对映面而产生的。预期具有高立体选择性,并且可以预测立体化学结果,其中构象偏向的酮具有空间上可区分的非对映面,其中只有一个面可进行亲核加成。酮的构象可以通过计算建模和在某些情况下通过 X 射线晶体学确定结构的组合来确定。