Oxidative iodination of carbonyl compounds using ammonium iodide and oxone®
作者:Mahender Reddy Marri、Arun Kumar Macharla、Swamy Peraka、Narender Nama
DOI:10.1016/j.tetlet.2011.09.106
日期:2011.12
A simple, efficient, mild, and regioselective method for oxyiodination of carbonyl compounds has been reported by using NH4I as the source of iodine and Oxone® as an oxidant. Various carbonyl compounds such as aralkyl ketones, aliphatic ketones (acyclic and cyclic), and β-keto esters proceeded to the respective α-monoiodinated products in moderate to excellent yields. Unsymmetrical aliphatic ketones
Oxidative 1, 2-aryl migration of alky aryl ketones (2, 5, and 8) to 2-arylalkanoates (3, 6, and 9) was effected by using diacetoxyphenyliodine (1). The migration was successfully applied to the preparation of the antiinflammatory agents ibuprofen (15) and clidanac (17).
First <i>anti</i>
-Selective Direct Michael Addition of α-Alkoxy Ketones to Enones by Cooperative Catalysis of Samarium(III) Trifluoromethanesulfonate and Tributyltin Methoxide
作者:Naoto Esumi、Yoshihiro Nishimoto、Makoto Yasuda
DOI:10.1002/ejoc.201700501
日期:2017.5.18
and Bu3SnOMe. The combination of these two catalysts effectively allowed the generation of enolate species from α-alkoxy ketones and produced Michael adducts in high yields with high anti diastereoselectivity. A variety of enones and α-alkoxy ketones were applied to this system to give the anti products. One-pot domino Michael/aldol reactions effectively afforded cyclic enones with a defined configuration
Catalytic [3+3] Annulation of
<scp>β‐Ketoethers</scp>
and Cyclopropenones
<i>via</i>
C(sp
<sup>3</sup>
)—O/C—C Bond Cleavage under
<scp>Transition‐Metal</scp>
Free Conditions
carbon-oxygen (C—O) bond is highly important for the transformation of oxygen-rich biomass and industry chemicals. Herein, an efficient [3+3] annulation of β-ketoethers with cyclopropenones in the presence of catalytic base has been developed, which proceeds through the C(sp3)—O bonds cleavage in β-ketoethers and C—C bond cleavage in cyclopropenones under transition-metal free conditions. The cleavage of C(sp3)—O
Visible Light‐Promoted Aerobic Oxidation of α‐Silyl Styrenes with Alcohols
作者:Yan Tan、Bo Yang、Jiale Ying、Bing Yu、Zhan Lu
DOI:10.1002/cjoc.202400602
日期:2024.12.15
A mechanistically distinctive visible-light-promoted metal-freeaerobicoxidation of alkenyl silanes with alcohols was disclosed to efficiently construct α-alkoxy ketones undermildconditions. The primary, secondary, and tertiary alcohols could be used as reactants. The protocol could be carried out on a gram-scale. Various derivatizations of products could be conducted. Mechanistic studies indicated