The oxidation of methylene carbon-carbon double bonds under FeIII-TBHP and FeIII-TBHP-PA conditions
摘要:
The oxidation of 1,1-diphenylethylene under Fe-III-TBHP and Fe-III-TBHP-PA conditions followed a pathway alkene to intermediate A to intermediate B to ketone. Intermediate A could be trapped by NaN3.
a novel approach to high value-added β-azidoalcohols, which are useful precursors of aziridines, β-aminoalcohols, and other important N- and O-containing heterocyclic compounds. This chemistry also provides an unexpected approach to azido substituted cyclic peroxy alcohol esters. A DFT calculation indicates that Mn catalyst plays key dual roles as an efficient catalyst for the generation of azido
已开发出一种用于合成 β-叠氮醇的高效锰催化的烯烃有氧氧化羟基叠氮化反应。公开了以空气为末端氧化剂的叠氮自由基的有氧氧化生成是该转化的关键过程。该反应以其广泛的底物范围、廉价的锰催化剂、高效率、在空气中容易操作以及室温下温和的条件而受到赞赏。这种化学反应为高附加值的 β-叠氮醇提供了一种新方法,它是氮丙啶、β-氨基醇和其他重要的含 N 和 O 杂环化合物的有用前体。这种化学反应还为叠氮取代的环状过氧醇酯提供了一种意想不到的方法。DFT 计算表明,Mn 催化剂作为产生叠氮自由基的有效催化剂和过氧自由基中间体的稳定剂起着关键的双重作用。进一步的计算合理地解释了所提出的控制 CC 键断裂或形成 β-叠氮醇的机制。
The synthesis of alkyl aryl nitriles from N-(1-arylalkylidene)cyanomethylamines. Part 2. Mechanism
作者:Alvise Perosa、Maurizio Selva、Pietro Tundo
DOI:10.1039/b106259j
日期:2002.4.29
intramolecular ring closure–CN elimination step, which yields the 2H-azirine. The azirine then isomerizes to the nitrile. Additional evidence for the intermediacy of the 2H-azirine, based on 1H NMR monitoring of the reaction 1 → 2, is described. Finally, the results of a simple isotope exchange experiment provide a rationale for the previously observed scrambling of labels, and further confirm the proposed
reagents to improve the chemoselectivity. To overcome the above problems, we present a photochemical hydroxyazidation of alkenes via Mn-mediated ligand-to-metal charge transfer (LMCT) in O2, which activates N3– to •N3 and incorporates O2 to be used as an oxygen source in the hydroxyazidation products. Broad alkene range and step-economy chemistry for the hydroxyazidation transformation were also demonstrated
最先进的烯烃羟基叠氮化策略,产生β-叠氮醇和β-叠氮过氧化物的混合物,必须依靠膦试剂来提高化学选择性。为了克服上述问题,我们提出了一种通过 O 2中锰介导的配体到金属电荷转移 (LMCT) 进行烯烃的光化学羟基叠氮反应,将 N 3 –活化为•N 3并结合 O 2用作氧来源为羟基叠氮化产物。还证明了羟基叠氮化转化的广泛烯烃范围和步骤经济化学。
Visible-Light-Promoted Metal-Free Aerobic Hydroxyazidation of Alkenes
作者:Bo Yang、Zhan Lu
DOI:10.1021/acscatal.7b02892
日期:2017.12.1
A highly efficient visible-light-promoted metal-free aerobic hydroxyazidation of alkenes has been developed. This protocol was operationally simple with broad substrate scope using relatively simple and readily available starting materials, such as alkenes and air, to construct valuable β-azido alcohols which are significant building blocks to build N-containing compounds. The distinct possible mechanisms
The oxidation of methylene carbon-carbon double bonds under FeIII-TBHP and FeIII-TBHP-PA conditions
作者:Derek H.R. Barton、Tie-Lin Wang
DOI:10.1016/s0040-4039(00)76747-5
日期:1994.3
The oxidation of 1,1-diphenylethylene under Fe-III-TBHP and Fe-III-TBHP-PA conditions followed a pathway alkene to intermediate A to intermediate B to ketone. Intermediate A could be trapped by NaN3.