Photoiodocarboxylation of Activated C═C Double Bonds with CO<sub>2</sub> and Lithium Iodide
作者:Rossella Mello、Juan Camilo Arango-Daza、Teresa Varea、María Elena González-Núñez
DOI:10.1021/acs.joc.8b02162
日期:2018.11.2
The photolysis at 254 nm of lithium iodide and olefins 1 carrying an electron-withdrawing Z-substituent in CO2-saturated (1 bar) anhydrous acetonitrile at room temperature produces the atom efficient and transition metal-free photoiodocarboxylation of the C═C double bond. The reaction proceeds well for terminal olefins 1 to form the new C–I and C–C σ-bonds at the α and β-positions of the Z-substituent
Radical addition of 2-iodoalkanamide or 2-iodoalkanoic acid to alkenols using a water-soluble radical initiator in water. A facile synthesis of γ-lactones
of 2-iodoacetamide and 5-hexen-1-ol in water at 75 °C in the presence of a water-soluble radical initiator, 4,4′-azobis(4-cyanopentanoic acid), provided γ-(4-hydroxybutyl)-γ-lactone in 95% yield. The use of 2-iodoacetic acid in place of 2-iodoacetamide also gave the same γ-lactone in 93 % yield.
Radical Addition of 2-Iodoalkanamide or 2-Iodoalkanoic Acid to Alkenes with a Water-Soluble Radical Initiator in Aqueous Media: Facile Synthesis of<i>γ</i>-Lactones
Radical reactions in water or aqueous ethanol using a water-soluble radical initiator are described. Heating a mixture of 2-iodoacetamide and 5-hexen-1-ol in water at 75 °C in the presence of a water-soluble radical initiator, 4,4′-azobis(4-cyanopentanoic acid), afforded 5-(4-hydroxybutyl)dihydrofuran-2(3H)-one in 95% yield. The use of 2-iodoacetic acid in place of 2-iodoacetamide also gave the same γ-lactone in 93% yield. The reaction of 2-iodoacetamide with 1-octene in aqueous ethanol was initiated by 2,2′-azobis(2-methylpropanamidine) dihydrochloride to provide γ-decanolactone. Employing water as a solvent is crucial to obtain lactone in satisfactory yield.
Platinum(II) mediated oxidation of remote CH bonds in functionalized organic molecules
作者:Naomi Basickes、Ayusman Sen
DOI:10.1016/0277-5387(94)00329-d
日期:1995.1
-CH δ -CH for alcohols and σ -CH ⪡ β -CH γ -CH ⪖ δ -CH for the acids. The reactions are thought to proceed by the initial coordination of the functional group followed up the formation of an intermediate platinacylce upon CH activation. The observed regioselectivity arises from the tendency to form the metallacycle with the least ring strain. It was possible to make the oxidations catalytic in
A NEW SYNTHESIS OF α-IODO CARBOXYLIC ACID USING IODINE-COPPER SALT
作者:C. Akira Horiuchi、J. Yasuo Satoh
DOI:10.1246/cl.1984.1509
日期:1984.9.5
Direct α-iodination of some carboxylic acids, namely, acetic acid, propionic acid, butyric acid, and valeric acid, using iodine-copper salt, gave the corresponding α-iodo carboxylic acid in high yield. This new synthetic method afforded several advantage over classical α-iodo carboxylic acid procedures.