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The carbon-13 nuclear magnetic resonance spectra of 30 isoquinoline quinones and 6 quinoline quinones are reported. The assignment of chemical shifts for the carbon atoms was achieved with the aid of… (More)
Synthese du propionyloxy-1 methyl-6 methoxy-7 dihydro-5,8 isoquinoleinedione-5,8 (A) et du formyl-1 dihydro-1,2 derive de (A) par acylation des hydroxymethyl-1 correspondants
Synthese de dihydro-5,8 dimethyl-1,6 methoxy-7 isoquinoleinedione-5,8 et de dihydro-1,2 formyl-2 renierone a partir du methyl-6 trimethoxy-5,7,8 isoquinoleinemethanol-1
6,11-Dihydrobenzo[b]pyrrolo[4,3,2-de][1,10]phenanthroline-5,8-dione (6), which possesses a unique heterocyclic ring system similar to that in plakinidines A–D (1–4), was synthesized from… (More)
A pentacyclic aza-aromatic alkaloid, meridine (1), was synthesized from 4-methoxy-5, 8-quinolinedione (4) and o-nitrocinnamaldehyde N, N-dimethylhydrazone (5) in four steps.
Abstract A pentacyclic aromatic alkaloid, kuanoniamine A ( 6 ) was synthesized in three steps from 6-methoxybenzothiazole-4,7-dione ( 8 ) and 2-aminoacetophenone ( 9 ). 11-Hydroxyascididemin ( 4 )… (More)
The oxidative demethylation of 4, 7-dimethoxyindoles to the corresponding 4, 7-dihydroindole-4, 7-diones with ceric ammonium nitrate is described.
5,8-Quinoxalinediones (3a-c, 12, 13), dibenzo[a,c]phenazine-10, 13-diones (5a, b), 5,8-quinazolinediones (17, 23), and 4,5,8(3H)-quinazolinetrione (21) were prepared using oxidative demethylation of… (More)
Abstract Refluxing 4-hydroxypyridine and α,α′-dibromo- o -xylene in an ethanolic sodium ethoxide solution affords α,α′-di-(4-pyridon-1-yl)- o -xylene ( 1 ) which undergoes a novel [2+2]… (More)