Copper-Catalyzed Diacetoxylation of Olefins using PhI(OAc)2 as Oxidant
摘要:
Copper(I) or -(II) salts with weakly coordinating anions catalyze the diacetoxylation of olefins efficiently in the presence of PhI(OAc)(2) as the oxidant under mild conditions, The reaction is effective for aryl, aryl alkyl, as well as aliphatic terminal and internal olefins forming the corresponding vicinal diacetoxy compounds in 70-85% yields and dr (syn/anti) of up to 5.2. Under these conditions, homoallylic alcohols formed the corresponding tetrahydrofuran derivatives in high yields.
Triflic Acid Catalyzed Oxidative Lactonization and Diacetoxylation of Alkenes Using Peroxyacids as Oxidants
作者:Yan-Biao Kang、Lutz H. Gade
DOI:10.1021/jo202491y
日期:2012.2.3
A clean and efficient diacetoxylation reaction of alkenes catalyzed by triflic acid using commercially available peroxyacids as the oxidants has been developed. This method was also applied in oxidative lactonizations of unsaturated carboxylic acids in good to high yields.
Iron-Catalyzed Dioxygenation of Alkenes and Terminal Alkynes by using (Diacetoxyiodo)benzene as Oxidant
作者:B. T. V. Srinivas、Vikas S. Rawat、Bojja Sreedhar
DOI:10.1002/adsc.201500681
日期:2015.11.16
syn-diacetoxylation of alkenes and 1,2-oxyacetoxylation of terminal alkynes has been developed using (diacetoxyiodo)benzene as oxidant. A broad range of internal and terminal alkenes, including electron-rich as well as electron-deficient alkenes, gave the desired products in good to excellent yields with high diastereoselectivity (up to >99:1 dr). In addition the high catalytic activity of ironcatalysis for the
The Nature of the Catalytically Active Species in Olefin Dioxygenation with PhI(OAc)<sub>2</sub>: Metal or Proton?
作者:Yan-Biao Kang、Lutz H. Gade
DOI:10.1021/ja110805b
日期:2011.3.16
Evidence for the protiocatalytic nature of the diacetoxylation of alkenes using PhI(OAc)(2) as oxidant is presented. Systematic studies into the catalytic activity in the presence of proton-trapping and metal-complexing agents indicate that protons act as catalysts in the reaction. Using triflic acid as catalyst, the selectivity and reaction rate of the conversion is similar or superior to most efficient metal-based catalysts. Metal cations, such as Pd(II) and Cu(II), may interact with the oxidant in the initiation phase of the catalytic transformation; however, 1 equiv of strong acid is produced in the first cycle which then functions as the active catalyst. Based on a kinetic study as well as in situ mass spectrometry, a mechanistic cycle for the proton-catalyzed reaction, which is consistent with all experimental data presented in this work, is proposed.
Horiuchi, C. Akira; Fukushima, Tomoaki; Furuta, Noriyuki, Journal of Chemical Research - Part S, 2003, # 5, p. 270 - 272
作者:Horiuchi, C. Akira、Fukushima, Tomoaki、Furuta, Noriyuki、Chai, Wen、Ji, Shun-Jun、Saito, Yoshikazu、Hashimoto, Chikao、Takahashi, T. Tomoyoshi、Sugiyama, Takashi、Muto, Akinori、Sakata, Yusaku、Nozaki, Sukekatsu