Oxidation by cobalt(III) acetate. Part 6. A novel synthesis of the glycol monoacetates from aromatic olefins in wet acetic acid
作者:Masao Hirano、Takashi Morimoto
DOI:10.1039/p29840001033
日期:——
Oxidation of various aryl-conjugated olefins with cobalt(III) acetate in wet aceticacid under nitrogen affords the glycol monoacetates in moderate to good yields. None of the phenyl rearrangement product is formed in the present reactions. These results are best interpreted by assuming the formation of a Co-co-ordinated intermediate.
Mechanisms for Manganese(III) Oxidations with Alkenes
作者:William E. Fristad、John R. Peterson、Andreas B. Ernst、Gordon B. Urbi
DOI:10.1016/s0040-4020(01)87310-5
日期:1986.1
metal complexed organic radicals, and the importance of an oxo-centered manganese(III) triangle are discussed as they relate to the lactone annulation reaction. Single electron transfer oxidation of alkenes is described as a route toward 1,2-diacetates of alkenes within the 8.1-7.5 eV I.P. range. Three less common modes of Mn(III) reaction are discussed and compared with the two primary processes of
在乙酸锰(III)与羧酸和烯烃的反应中,已经鉴定出三个不同的过程,它们涉及烯烃和两个独立于烯烃的过程。通过产品研究,重排,稀释实验和文献动力学数据的组合,可以提出一个统一的机制图来描述这些过程。具体地,讨论了羧酸组分的α-H酸的作用,缺电子的自由基加成,金属络合的有机自由基以及以氧代为中心的锰(III)三角形的重要性,因为它们与内酯环化反应有关。烯烃的单电子转移氧化被描述为通往8.1-7.5 eV IP范围内的烯烃1,2-二乙酸酯的途径。
The synthesis of the anti-malarial natural product polysphorin and analogues using polymer-supported reagents and scavengers
作者:Ai-Lan Lee、Steven V. Ley
DOI:10.1039/b308761a
日期:——
A general asymmetric route to both enantiomers of polysphorin has been developed. The route utilizes polymer-supported reagents, catalysts and scavengers to minimise the need for aqueous work-up and chromatography. This includes application of a method to scavenge 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and a “catch-and-release” procedure to extract the resultant diol following Sharpless asymmetric dihydroxylation. A novel enzymatic selective protection and investigations of a new asymmetric dihydroxylation using microencapsulated osmium tetroxide were also investigated during the course of this study.
electrochemical method of the introduction of α-acetoxy or α-methoxy group on a ketone was applied to accomplish the 1,2-carbonyl transposition in ketones. The acid-catalyzed reaction of β-acetoxy or β-methoxy alcohols prepared by the reduction or Grignard reaction of the α-acetoxy or α-methoxy ketones gave the 1,2-carbonyl transposedketones.
A Simple Synthetic Route to Enantiopure α-Hydroxy Ketone Derivatives by Asymmetric Hydrogenation
作者:Tian Sun、Xumu Zhang
DOI:10.1002/adsc.201200224
日期:2012.11.26
DuanPhos has been proved to be the most effective ligand for this reaction. The high yield and enantioselectivity of the asymmetric hydrogenation of the α-ketone enol acetates represents a feasible syntheticroute to important pharmaceutical building blocks: α-hydroxy ketones.