Naphtho furan-4,9-diones

Chemical Name 5,6,9,17,19,21 -hexahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-8-(N-(4-methyl-1-piperazinyl)formimidoyl] -2,7-(epoxypentadeca(1,11,13]trienimino)-naphtho[2,1-b] furan-1,11 (2H)-dione 21-acetate... [Pg.1358]

Terecamphene 3a,8a,9,9a-Tetrahydro-5,8a-dimethyl-3-inethylene-naphtho- [2,3-b]-furan-2,6(3H,4H)-dione (-)-Camphene Yomogin... [Pg.18]

Benz-annelatedbenzo[c]furandiones—naphtho[2,3-c]furan-4,9-diones— (Table XIII) were prepared in moderate to good yields by a Friedel-Crafts... [Pg.237]

The tautomeric equlibrium between naphtho[2,3-f]furan-4(9//)-one 65 and naphtho[2,3-f]furan-9-ol 66 (together with that of related systems) has been briefly reviewed <2005T9929> and exemplified in the case of 5,8-dihydroxy-naphtho[2,3-f]furan-4,9-dione <2005AJC600>. [Pg.401]

The oxidative formation of the quinone part was used also for the preparation of some benzo[h]naphtho[2,3-d]furan-6,l 1-diones [brasanquinones (137)] (03CB2199,03CB2202 08CB2373 09JCS398 70JIC567) or analogous systems (78CJC517). [Pg.64]

The structures of the seven naphthoquinones were identified as (2S, 3S)-3-hydroxy-5,6-dimethoxydehydroiso-a-lapachone (94), (2R)-5,6-dimethoxydehydroiso-a-lapachone (95), (2R)-5-methoxydehydroiso-a-lapachone (96), 2-(1-hydroxyethyl)-naphtho[2,3-b]furan-4,9-dione (97), 5-hydroxy-2-(1-hydroxyethyl)naphtho 2,3-b furan-4,9-dione (98), 2-isopropenylnaphtho 2,3-b furan-4,9-dione (99), and 5-hydroxy-dehydroiso-a-lapachone (100), all of which were found to be bioactive [73],... [Pg.494]

Naphtho[2,3-c]furan-1,3-dione 2,3-Naphthalenedicarboxylic acid anhydride Ci2Hg03 716-39-2 198.174 246 si EtOH, chi s eth, bz... [Pg.506]

Pyrolysis of tri-, tetra-, and penta-chlorobenzenes affords mixtures of chlorinated dibenzofurans and dibenzo-p-dioxins, " and chlorinated diphenyl ethers cyclize in the presence of palladium acetate to polychloro-dibenzofurans/ The action of malononitrile on tetrahydroxy-p-benzoquinone leads to the benzo-difuran (79), contrary to a previous report/ The acid-catalysed condensation of quinones with phenols has been studied p-benzoquinone and resorcinol, for example, afford compound (80)/ Naphtho[2,3- >]furan-4,9-diones (81 R = Me or Ph R = Ac, Bz, C02Et, or CN) are obtained from 2,3-dichloronaphtho-1,4-quinone and compounds R COCHaR in DMF that contains potassium fluoride/ The action of mineral acids on p-benzoquinone produces a mixture of complex benzofurans, which includes (82) and (83)/ Bases convert the ben-zofuranone (84) into the tetrameric compound (85), contrary to an earlier... [Pg.153]

Naphtho[2,3-c]furan-4,9-diones and related compounds 05T9929. [Pg.62]

Scheme 12.50 Domino synthesis of naphtho[2,3-fc]furan-4,9-diones.

Constit. of Crescentia cujete. Cytotoxic. Mp 217-218°. 9-Hydroxy [150994-77-7]. 9-Hydroxy-3- hydroxymethyl) furo[3,2-h]naphtho[2,3-d]furan-5,10-dione CisHgO M 284.225 Constit. of C. cujete. Cytotoxic. Mp 221-223°. [Pg.221]

Hydroxy-2-(3-hydroxy-3-methylbutyl)-5-methoxybibenzyl, in H-20173 11 -Hydroxy-3-( 1 -hydroxy-3-methylbutyl)-4-methoxy-9-methyl-5//,7//-dibenzo[/ ,g][l,5] dioxocin-5-one, see P-10025 1 -[4-[2-Hydroxy-1 -(hydroxymethyl)ethoxy]-3-methoxyphenyl]-2-[4-(3-hydroxypropyl)-2-methoxyphenoxy]- ,3-propanediol, H-30157 9-Hydroxy-3-(hydroxymethyl)furo[3,2-/ ] naphtho[2,3- furan-5,10-dione, in H-30185... [Pg.468]

Naphtho[ 1,2- ]furan-4,5-dione, N-20005 Naphtho[2,3-6]furan-4,9-dione, N-20006... [Pg.526]

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