Palladium-Catalyzed Cyclopropanation of Unsaturated Endoperoxides. A New Peroxide-Preserving Reaction
作者:Michael A. Emerzian、William Davenport、Jiangao Song、Jim Li、Ihsan Erden
DOI:10.1002/adsc.200800804
日期:2009.5
Unsaturated bicyclic endoperoxides are efficiently cyclopropanated with excess diazomethane in the presence of catalytic Pd(OAc)2 in a stereoselective manner. This method represents a new peroxide preserving transformation. Whereas the unsaturated endoperoxides in the [2.2.1] series are attacked by the carbene from the exo face, the analogs with larger bridges are preferentially attacked from the face
Synthesis of eight-membered aminocyclitol analogues
作者:Yunus Zozik、Emine Salamci、Ayşe Kilic
DOI:10.1016/j.tetlet.2017.11.014
日期:2017.12
gave a bicyclic endoperoxide, which was reduced with zinc followed by mesylation of the hydroxyl groups. Treatment with sodiumazide afforded 1,4- and 1,2-cyclooctene diazides. Oxidation of the double bonds in the isomeric diazides with OsO4, followed by hydrogenation of the azide groups, led to 3,8-diaminocyclooctane-1,2-diol and 3,4-diaminocyclooctane-1,2-diols. In the second part, cis-3,8-diazidocyclooctene
The present investigation was undertaken in order to see whether singlet oxygen-oxidation of unconjugated cyclic dienes having spatially close double bonds causes a particular transannular reaction as previously observed with 1,5-cyclooctadiene which gave 4-hydroxy-5-cyclooctenone. Most cyclic dienes tested underwent normal “ene” reaction to give allylic hydroperoxides. Thus, on dye-sensitized photooxygenation
Photocatalytic Properties of a Palladium Metallosquare with Encapsulated Fullerenes via Singlet Oxygen Generation
作者:Víctor Martínez-Agramunt、Eduardo Peris
DOI:10.1021/acs.inorgchem.9b02097
日期:2019.9.3
organic synthesis and biological studies. However, the photosensitizers that are required for singlet oxygen generation remain inadequate due to their often low thermal and photochemical stabilities. Here we describe the use of a palladium-conjoined metallosquare with encapsulated fullerenes (C60 or C70), which behaves as an efficient and photochemicallystable singlet oxygen photosensitizer. The metallocage
An Asymmetric Synthesis of <i>trans</i>-Fused Butyrolactones from Endoperoxides
作者:Joshua Priest、Mark. R. Longland、Mark R. J. Elsegood、Marc C. Kimber
DOI:10.1021/jo400177j
日期:2013.4.5
equivalents to endoperoxides in the presence of an organocatalyst yields trans-fused butyrolactones in high yield and enantioselectivities. This methodology expands the synthetic utility of endoperoxides and further underlines their potential as sources of oxygen functionality for natural and non-natural product target synthesis.