Polar effects in free-radical reactions. A novel homolytic acylation of heteroaromatic bases by aerobic oxidation of aldehydes, catalysed by<i>N</i>-hydroxyphthalimide and Co salts
A new process for the homolytic acylation of protonated heteroaromatic bases is described; an N-oxyl radical (PINO) generated from N-hydroxyphthalimide by air oxygen and Co(II) abstracts a hydrogen atom from an aldehyde. The resulting nucleophilicacylradical adds to a heteroaromatic base, which is then rearo-matised in a chain process. Quinazoline has an anomalous behaviour, giving 3H-quinazolin-4-one
Exploring Eosin Y as a bimodular catalyst: organophotoacid mediated Minisci-type acylation of <i>N</i>-heteroarenes
作者:Vishal Jyoti Roy、Partha Pratim Sen、Sudipta Raha Roy
DOI:10.1039/d1cc06483e
日期:——
conditions. Spectroscopic investigations such as steady state fluorescence quenching and dynamic lifetime quenching experiments were employed to better understand the role of Eosin Y as both a photoredox catalyst and a photoacid. Feedstock aldehydes were employed as acyl radical precursors for engaging in C–C bond formation reactions with a variety of nitrogen containing heterocycles.
在这里,我们报告了伊红 Y 作为 Minisci 型酰化反应的双模块催化剂。发现在光激发的曙红 Y 和N-杂芳烃之间形成有机激发物是优化条件下光酸催化的稳定因素。采用光谱研究,例如稳态荧光猝灭和动态寿命猝灭实验,以更好地了解曙红 Y 作为光氧化还原催化剂和光酸的作用。原料醛被用作酰基自由基前体,用于与各种含氮杂环进行 C-C 键形成反应。
HADDADIN M. J.; CHELHOT N. C.; PIERIDOU M., J. ORG. CHEM. <JOCE-AH>, 1974, 39, NO 22, 3278-3281 D2 =#2#M
A novel heterocyclic compound is provided. In particular, a novel heterocyclic compound which can improve the element characteristics of the light-emitting element is provided. The heterocyclic compound is represented by a general formula (G1)
DBq-(Ar
1
)-
n
-Ar
2
-A (G1)
in which a substituted or unsubstituted dibenzo[f,h]quinoxalinyl group and a substituted or unsubstituted benzobisbenzofuranyl group are bonded to each other via a substituted or unsubstituted arylene group. In the general formula (G1), DBq represents a substituted or unsubstituted dibenzo [f,h] quinoxalinyl group, Ar
1
represents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms, n represents 0 or 1, Ar
2
represents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms, and A represents a substituted or unsubstituted benzobisbenzofuranyl group. When the arylene group represented by Ar
1
and Ar
2
has substituents, the substituents may be bonded to each other to form a ring.
Synthesis of 2-amino-2-butene-1,4-diones via three-component reactions of dihydroxyketones, amines and sulfoxonium ylides