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
A variety of 2-(2-methylphenyl)-2-oxoethyl acetates were prepared from aromaticketones by α-oxidation in acetic acid, using palladium acetate as catalyst and (diacetoxyiodo)benzene as oxidant. The X-ray crystal structure of 5-acetyl-2-hydroxy-4-methylphenyl acetate was determined.
以乙酸钯为催化剂,(二乙酰氧基碘)苯为氧化剂,通过在乙酸中α-氧化芳族酮制备了多种2-(2-甲基苯基)-2-氧代乙酸乙酯。确定了 5-乙酰基-2-羟基-4-甲基苯基乙酸酯的 X 射线晶体结构。
2,5-Dimethylphenacyl Esters: A Photoremovable Protecting Group for Carboxylic Acids
or cyclohexane solutions produces the corresponding free carboxylicacids (2a−c) in high chemical yields, along with 6-methyl-1-indanone (3). In methanol, 2-(methoxymethyl)-5-methylacetophenone (4) is formed as a coproduct. Quantum yields for the photorelease of the DMP group are higher in nonpolar solvents, φ ≈ 0.2, than in methanol, φ ≈ 0.1. The photoreaction is initiated by efficient photoenolization
2,5-Dimethylphenacyl as a New Photoreleasable Protecting Group for Carboxylic Acids
作者:Petr Klán、Miroslav Zabadal、Dominik Heger
DOI:10.1021/ol005789x
日期:2000.6.1
The 2,5-dimethylphenacyl chromophore, a new photoremovable protectinggroup for carboxylic acids, is proposed. Direct photolysis of various 2,5-dimethylphenacyl esters in benzene or methanol at 254-366 nm leads to the formation of the corresponding carboxylic acids in almost quantitative isolated yields. The photodeprotection is based on efficient intramolecular hydrogen abstraction without the necessity