作者:Shelli R. Mellegaard-Waetzig、Chao Wang、Jon A. Tunge
DOI:10.1016/j.tet.2005.12.072
日期:2006.7
Organoselenides catalyze the oxidation of halides by H2O2. Furthermore, these selenides catalyze the transfer of oxidized halogens from N-halosuccinimides to olefins and ketones. Thus, organoselenides catalyze oxidative halogenation reactions including halolactonization, α-halogenation of ketones, and allylic halogenation. The ability of selenium to undergo reversible 2e− oxidation–reduction chemistry
有机硒化物通过H 2 O 2催化卤化物的氧化。此外,这些硒化物催化氧化的卤素从N-卤代琥珀酰亚胺向烯烃和酮的转移。因此,有机硒化物催化氧化卤化反应,包括卤代内酯化,酮的α-卤化和烯丙基卤化。硒的能力经历可逆2E -氧化-还原化学功能有助于卤化硒通过绑定卤中间体。
Ytterbium triflate catalyzed synthesis of chlorinated lactones
The direct synthesis of chlorolactones from differently substituted alkenoic acids, using either sodium hypochlorite or chloramineT as the source of electrophilic chlorine and ytterbium triflate hydrate as the Lewis acid is described. In both cases the reactions proceeded in good yields affording selectively five- or six-membered chlorolactones.
On the Mechanism of the Selenolactonization Reaction with Selenenyl Halides
作者:Scott E. Denmark、Michael G. Edwards
DOI:10.1021/jo0610457
日期:2006.9.1
The mechanism of selenocyclization reactions of β,γ-unsaturated acids and their derivatives has been studied. The reactions of (E)-4-phenyl-3-butenoic acid 10 and its silyl and alkyl esters with benzeneselenenyl chloride (PhSeCl) and bromide (PhSeBr) have been examined by VT-NMR and in situ IR spectroscopic methods. Whereas the reactions of the acid 10 in the presence of a base were irreproducible
Indium chloride mediated chlorolactonization: construction of chlorinated lactone fragments
作者:Hideki Abe、Naoki Fukazawa、Toyoharu Kobayashi、Hisanaka Ito
DOI:10.1016/j.tet.2013.01.072
日期:2013.3
Chlorolactonization of unsaturated acids with chloramine-T catalyzed by indium chloride as a Lewis acid was demonstrated. This is a new synthetic methodology for the construction of chlorinated lactone frameworks from unsaturated acids. (C) 2013 Elsevier Ltd. All rights reserved.