Efficient Synthesis of 3-Chloromethyl-2(5<i>H</i>)-furanones and 3-Chloromethyl- 5,6-dihydropyran-2-ones via the PdCl<sub>2</sub>-Catalyzed Chlorocyclocarbonylation of 2,3- or 3,4-Allenols
作者:Xin Cheng、Xuefeng Jiang、Yihua Yu、Shengming Ma
DOI:10.1021/jo8015677
日期:2008.11.21
was formed between the center carbon atom of the allene moiety and the hydroxyl oxygen, which was established by the X-ray single crystal diffraction study of gamma-lactone 3p. The highly opticallyactive 3-chloromethyl-2(5H)-furanones could be easily prepared from the readily available opticallyactive 2,3-allenols. A mechanism for this reaction was proposed.
A tandem oxidativecouplingreaction of β-ketoallenes and arenes was developed, which leads to the formation of 2-furylmethylarenes using AuCl3 and phenyliodine diacetate. The AuIII salt catalyzed the cyclization of β-ketoallenes to form a 2-furylmethyl gold intermediate, and the subsequent C–H functionalization of arenes proceeded smoothly. During the oxidativecoupling, nucleophilic additions occurred
Conjugated Diene-Assisted Allylic C−H Bond Activation: Cationic Rh(I)-Catalyzed Syntheses of Polysubstituted Tetrahydropyrroles, Tetrahydrofurans, and Cyclopentanes from Ene-2-Dienes
作者:Qian Li、Zhi-Xiang Yu
DOI:10.1021/ja100409b
日期:2010.4.7
activation of allylic C-H bonds and their subsequent insertion into the alkene moieties of conjugateddienes. This novel C-H activation/alkene insertionreaction provides an efficient way to synthesize polysubstituted tetrahydropyrroles, tetrahydrofurans, and cyclopentanes with quaternary carbon centers. Preliminary mechanistic studies using D-labeling experiments have revealed that allylic C-H activation
Stannyldienes, new tools for organic synthesis. preparatiom and reactivity
作者:Cristina Nativi、Maurizio Taddei、André Mann
DOI:10.1016/0040-4020(89)80022-5
日期:1989.1
for a regiocontrolled transfer of the dienic structure by : a)tin-lithium exchange and further reaction with aldehydes to give conjugated dienic alcohols; b)coupling with acyl chlorides in the presence of palladiumcatalysts to give conjugated dienic ketones; c) AlCl3, promoted reaction with acyl chlorides to give allenic ketones.
Palladium-Catalyzed Stereoselective Cyclization of <i>in Situ</i> Formed Allenyl Hemiacetals: Synthesis of Rosuvastatin and Pitavastatin
作者:Pierre A. Spreider、Bernhard Breit
DOI:10.1021/acs.orglett.8b01156
日期:2018.6.1
A diastereoselective palladium-catalyzed cyclization of allenyl hemiacetals is described. It permits the selective synthesis of 1,3-dioxane derivatives, precursors for syn-configured 1,3-diols which make an appearance in all of the statin representatives. The reaction allows the total synthesis of Rosuvastatin and Pitavastatin in a straightforward fashion.