[EN] TROPOLONE DERIVATIVES AND TAUTOMERS THEREOF FOR IRON REGULATION IN ANIMALS [FR] DÉRIVÉS DE TROPOLONE ET LEURS TAUTOMÈRES POUR LA RÉGULATION DU FER CHEZ LES ANIMAUX
Regioselective Arene and Heteroarene Functionalization: <i>N</i>-Alkenoxypyridinium Salts as Electrophilic Alkylating Agents for the Synthesis of α-Aryl/α-Heteroaryl Ketones
作者:Rong L. Zhai、Yun S. Xue、Ting Liang、Jia J. Mi、Zhou Xu
DOI:10.1021/acs.joc.8b01388
日期:2018.9.7
electrophilic alkylating agents for the synthesis of α-aryl/heteroaryl ketones has been developed. The method generates alkylating agents from alkynes and N-pyridine oxide followed by site-selective electrophilic substitution with a broad range of arenes and heteroarenes including benzene derivates, phenols, ethers, indoles, pyrroles, furans, and thiophenes in onepot. Kinetic isotope effect measurements
Visible Light Photoredox Cross-Coupling of Acyl Chlorides with Potassium Alkoxymethyltrifluoroborates: Synthesis of α-Alkoxyketones
作者:Javad Amani、Esmat Sodagar、Gary A. Molander
DOI:10.1021/acs.orglett.5b03705
日期:2016.2.19
A visible-light, single-electron-transfer (SET), photoredox cross-coupling for the synthesis of α-alkoxyketones has been developed. In this method, various aliphatic and aromatic acyl chlorides were successfully coupled with structurally diverse potassium alkoxymethyltrifluoroborates, producing the corresponding α-alkoxyketones with high yields. In this operationally simple and mild cross-coupling
Evidence for a 1,4-dioxy diradical as an intermediate in the thermal decomposition of 3,3-dibenzyl-1,2-dioxetane
作者:Waldemar Adam、Markus Heil
DOI:10.1021/ja00049a009
日期:1992.11
The thermal decomposition of 3,3-dibenzyl-1,2-dioxetane (1) in CDCl 3 and CH 2 Cl 2 solutions afforded the expected decomposition product 1,3-diphenyl-2-propanone (2) and the novel rearrangement ketone 1-(benzyloxy)-3-phenyl-2-propanone (3) in ratios of (73±10):(27±10). A plausible mechanism for the formation of ketone 3 involves homolytic cleavage of the dioxetane peroxide bond with subsequent β cleavage
Thermolysis of 3,3-Bis(phenylmethyl)-1,2-dioxetane: Radical-Induced Formation of the Unusual Decomposition Product 3-Phenyl-1-(phenylmethoxy)-2-propanone
作者:Waldemar Adam、Simone Andler
DOI:10.1021/ja00092a019
日期:1994.6
The formation of the rearrangement ketone 3-phenyl-1-(phenylmethoxy)-2-propanone (3) in the thermolysis of 3,3-bis(phenylmethyl)-1,2-dioxetane (1) was rigorously probed for radical-induced chain decomposition. The latter mechanism appears to operate on the basis of the following experimental facts: (a) thermolysis of a mixture of the dioxetanes 1-h(4) and 1-d(4) afforded significant amounts of the crossover beta-keto ethers 3-h(2) and 3-d(2), (b) decomposition in toluene-d(8) in the presence of tert-butyl peroxalate (4) resulted in substantial incorporation of externally generated phenylmethyl-d(7) radicals in the form of the a-keto ether 3-d(7), and (c) in the presence of the triplet quenchers dibromomethane and 2,3-diazabicyclo[2.2.1]hept-2-ene (DBH) the formation of the beta-keto ether 3 was suppressed. Clearly, in the thermolysis of dioxetane 1, free phenylmethyl radicals are generated through Norrish type I cleavage of triplet-excited 1,3-diphenyl-2-propanone (2). Attack on the dioxetane peroxide bond leads to the beta-keto ether 3 by beta cleavage of the resulting alkoxy radical with regeneration of the chain-carrying phenylmethyl radical.