Iodination of nitroarenes by a superactive reagent based on iodine chloride
作者:V. K. Chaikovskii、T. S. Kharlova、V. D. Filimnov
DOI:10.1007/bf02495292
日期:1999.7
Iodinechloride reacts with Ag2SO3 in H2SO4 to give a new superelectrophilic reagent capable of iodinating nitrobenzene, halogenated nitrobenzenes, nitrotoluenes, and aromatic compounds with two nitro groups in the ring. Mononitroarenes are easily iodinated at 0–20°C, while dinitroarenes require heating to 100–170°C.
Access to 2-(Het)aryl and 2-Styryl Benzoxazoles via Palladium-Catalyzed Aminocarbonylation of Aryl and Vinyl Bromides
作者:Karoline T. Neumann、Anders T. Lindhardt、Benny Bang-Andersen、Troels Skrydstrup
DOI:10.1021/acs.orglett.5b00642
日期:2015.5.1
procedure for the synthesis of either 2-(hetero)aryl or 2-styryl benzoxazoles is reported, starting from aryl and vinyl bromides, respectively, involving an initial aminocarbonylation with 2-aminophenols as nucleophiles followed by an acid mediated ring closure to generate the heterocycle. The methodology displays a broad substrate scope in moderate to excellent yields and can be exploited for 13C-isotope
late-stage oxygenation of sulfur-containing complex molecules with ground-stateoxygen under ambient conditions. The high oxidation potential of the active uranyl cation (UO2 2+ ) enabled the efficient synthesis of sulfones. The ligand-to-metal charge transfer process (LMCT) from O 2p to U 5f within the O=U=O group, which generates a UV center and an oxygen radical, is assumed to be affected by the solvent
氧合是合成中的基本转变。在这里,我们描述了在环境条件下用基态氧对含硫配合物分子的选择性后期氧合。活性铀酰阳离子(UO2 2+)的高氧化势使砜的有效合成成为可能。假设O = U = O组中从O 2p到U 5f的配体到金属的电荷转移过程(LMCT)会产生UV中心和一个氧自由基,并且受溶剂和添加剂的影响,并且可以调整以促进选择性硫氧化。这种可调策略可以通过后期氧合以原子和步长高效的方式分批合成32种药物和类似物。
Superactive Iodination Reagent on a Base of Iodine Chloride and Silver Sulfate
作者:Vitold K. Chaikovski、Tatjana S. Kharlova、Victor D. Filimonov、Tamara A. Saryucheva
DOI:10.1055/s-1999-3475
日期:1999.5
After reaction of ICl and Ag2SO4 in sulfuric acid and separation of resulting AgCl a stable solution is formed, containing very active forms of electrophilic iodine. This solution has a powerful iodination ability with respect to aromatic compounds. Deactivated arenes are iodinated easily and in mild conditions by action of this new reagent in generally good yields of the iodoarenes.