已经研究了氧取代的萘与单线态氧(1 O 2)的反应,并且首次分离了不稳定的过氧化物,并在–78°C下进行了表征。紫外光谱的低温动力学表明,与1,4-二甲基萘相比,烷氧基和甲硅烷氧基取代基显着提高了光氧合速率,而酰氧基取代的并苯对1 O 2呈惰性。反应性与我们通过密度泛函理论计算确定的HOMO能量和自由活化能很好地相关。分离出的过氧化物的不稳定性是由于它们即使在–20°C下在释放1时也会与相应的萘发生非常快速的逆反应。O 2,使其在非常温和的条件下成为该反应物种的上等来源。最终,合成了碳水化合物取代的萘,该萘可与1 O 2可逆反应,并可能在未来的工作中用于对映选择性氧化。
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
Singlet oxygen mediated alkaloid tertiary amines oxidation by single electron transfer
作者:Clotilde Ferroud、Patrice Rool、Jean Santamaria
DOI:10.1016/s0040-4039(98)02184-4
日期:1998.12
A chemical study of the oxidation of tertiaryamines and alkaloids through monoelectronic transfer is presented and allows us to assign to singlet oxygen a new behavior as electron acceptor during the oxidation process.
Lewis acid catalysed rearrangements of unsaturated bicyclic [2.2.n] endoperoxides in the presence of vinyl silanes; access to novel Fenozan BO-7 analogues
作者:Paul M. O’Neill、Sarah L. Rawe、Richard C. Storr、Stephen A. Ward、Gary H. Posner
DOI:10.1016/j.tetlet.2005.03.022
日期:2005.4
Reactions of a series of unsaturated bicyclic [2.2.n] endoperoxides with allyltrimethylsilane in the presence TMSOTf or SnCl4 provides the cis-configured endoperoxides 9a–12. It is proposed that this novel reaction proceeds via attack of the allylsilane on the carbocation derived from heterolytic cleavage of the endoperoxide bridge. The reaction proceeds with a high degree of diastereoselectivity and
Synthesis of New 1,2,4-Trioxanes and their Antimalarial Activity
作者:Charles W. Jefford、Ernest C. McGoran、John Boukouvalas、Geoffrey Richardson、Brian L. Robinson、Wallace Peters
DOI:10.1002/hlca.19880710722
日期:1988.11.2
The three dihydronaphtho[1,2,4]trioxines 9–11 have been synthesized and two of them converted to the five carbamate and ester derivatives 12–16 (Schemes 1 and 2). The resulting new trioxanes together with two already known and ascaridole (7) were tested for antimalarial activity against the sensitive N strain of Plasmodium berghei in mice. On comparison with artemisinin (1) and dihydroartemisinin (2)