Stereoselective Syntheses of (-)-Podorhizol Lignan and its Derivatives:erythroandthreoPreferential Aldol Condensation of Potassium Enolate from γ-Butyrolactone with Alkoxybenzaldehyde
Synthesis and spectroscopic characterization of model compounds for the active site cofactor in copper amine oxidases
作者:Minae Mure、Judith P. Klinman
DOI:10.1021/ja00069a008
日期:1993.8
The synthesis and spectroscopic characterization of compounds which model different forms of the active site cofactor in copper amine oxidases have been pursued. As described, 5-(2,4,5-trihydroxybenzyl)hydantoin (1 red H 3 ), its corresponding quinone (1 ox H), and 6-amino-4-ethylresorcinol (7H 2 ) have been prepared. Additionally, 5-(3,4-dihydroxybenzyl)hydantoin (2 red H 2 ) was synthesized for comparative
已经进行了模拟铜胺氧化酶中不同形式的活性位点辅因子的化合物的合成和光谱表征。如上所述,已经制备了 5-(2,4,5-三羟基苄基) 乙内酰脲 (1 red H 3 )、其相应的醌 (1 ox H) 和 6-氨基-4-乙基间苯二酚 (7H 2 )。此外,还合成了 5-(3,4-二羟基苄基) 乙内酰脲 (2 red H 2 ) 用于比较目的
General methods for the preparation of deuterium and tritium-labelled phenethylamines and phenethanollamines: Synthesis of radioactive 6-hydroxydopamine
作者:A. Rotman、J. W. Daly、C. R. Creveling
DOI:10.1002/jlcr.2590110320
日期:——
A convenient synthetic method for preparation of phenethylamines and phenethanolamines labeled with deuterium or tritium has been developed. A substituted benzaldedyde is condensed with nitromethane or nitroethane and the resultant nitrostyrene is reduced with sodium borotritide or borodeuteride. Subsequent reduction of the nitro-group and removal of blocking groups yields a phenethylamine or an a-methylphenethylamine containing a tritium or deuterium in the benzylic position. Condensation of the substituted benzaldehyde with nitromethane or nitroethane at low temperature yields a nitroalcohol which is oxidized to a ketone with Jones reagent. Reduction with sodium borotritide or borodeuteride and subsequent reduation of the nitro-group and removal of blocking groups yields a phenethanolamine or α-methylphenethanolamine labeled in the bensylic position. Preparation of deutero- and/or tritio-labeled 2,4,5-trihydroxyphenethylamine (6-hydroxydopamine). α-methyl-6-hydroxydopamine, α-methyl-p-tyramine, β-phenethanolamine. 2-hydroxyphenethanolamine and α-methyl-4-benzyloxyphenethanolamine is described.
Modified syntheses of 2,4,5-trihydroxyphenylalanine, 2,4,5-trihydroxyphenethylamine, and analogs
作者:Fred G. H. Lee、Donald E. Dickson、Albert A. Manian
DOI:10.1021/jm00285a034
日期:1971.3
Synthesis and Characterization of Models for the 2,4,5-Trihydroxyphenylalanine (TOPA)-Derived Cofactor of Mammalian Copper Amine Oxidases, and Initial Amine Reactivity Studies
作者:Fengjiang Wang、Jin-Young Bae、Alan R. Jacobson、Younghee Lee、Lawrence M. Sayre
DOI:10.1021/jo00088a023
日期:1994.5
The mammalian copper amine oxidases effect the oxidative deamination of primary amines through utilization of an ''active carbonyl'' cofactor, shown recently to be the quinone form (TPQ) of a protein-based 2,4,5-trihydroxyphenylalanine (TOPA) residue. We synthesized three models for the cofactor in both reduced (benzenetriol) and oxidized (hydroxyquinone) forms, which differ in the nature of the alkyl substituent mimicking the connection to the protein backbone: hydantoinylmethyl, phthalimidoethyl, and pivalamidoethyl. The quinone forms were capable of deaminating benzylamine in aqueous CH3CN both stoichiometrically and catalytically (in the presence of O-2), but incapable of deaminating non-benzylic amines. In order to clarify the various reactions potentially occurring during aerobic autorecycling deamination, we studied the pH-dependent benzenetriol --> hydroxyquinone autoxidation as well as the possible reaction of amines with the benzenetriol forms. The latter undergo stoichiometric substitution with amines to give (alkylamino)resorcinols, not via cyclohexadienone tautomerization previously proposed, but via a redox cycling mechanism involving condensation of the amines with traces of hydroxyquinone present in the benzenetriol preparations. This observed substitution regiochemistry, as well as structural characterization of the hydroxyquinone arylhydrazine derivatives, confirms that amines react exclusively at the electrophilic C5 carbonyl position of TPQ models. Both the hydroxyquinone and benzenetriol forms were found to react with ethylenediamine in the presence of O-2 to give 6-hydroxy-7-(2-pivalamidoethyl)quinoxaline, consistent with the postulated generation of such moiety when lysyl oxidase is inactivated by ethylenediamine.
BHAT, G. A.;DICKSON, D. E., MONATSH. CHEM., 1984, 115, N 1, 113-116