2-Ethoxy-5-nitro

In the presence of methanol and ethanol the reaction leads to the formation of Q-methoxy- and ethoxy -nitro compounds ... 

Ethoxy carbonyl)-7-nitro Ethyl 2-niethyl-3-oxobutanoate PPA 78 [5]... 

Substitutions that displace electrons toward the carboxyl group of aromatic acids diminish the rate of the reaction (16). The substitution of fluoromethoxy or ethoxy groups in the ortho position has an accelerating action, whereas iodo, bromo, nitro, or methyl groups produce retardation. The influence of groups in the meta and para positions is not nearly so marked (17). 

Dibenzothiophene, 8-ethoxy-4-iodo-2-nitro-synthesis, 4, 881 Dibenzothiophene, ethyl-occurrence, 4, 910 Dibenzothiophene, methyl-occurrence, 4, 910 Dibenzothiophene, S-methyl-theoretical methods, 4, 3... 

Oxetane, 2-ethoxy-3,3-dimethyl-2-phenyl-thermolysis, 7, 372 Oxetane, 3-fluoro-synthesis, 7, 390 Oxetane, 3-fluoro-3-nitro-synthesis, 7, 391 Oxetane, 3-iodo-synthesis, 7, 390... 

The cleavage proceeds by initial reduction of the nitro groups followed by acid-catalyzed cleavage. The DNB group can be cleaved in the presence of allyl, benzyl, tetrahydropyranyl, methoxy ethoxy methyl, methoxymethyl, silyl, trityl, and ketal protective groups. 

In all 3-nitronaphthyridines with an unsubstituted C-2 position (84a, 84f, and 84j) no traces of the corresponding 2-amino-3-nitro-l,X-naphthyridines (X = 5, 6, and 8) were obtained. As already mentioned, in the aminations of 2-R-3-nitronaphthyridines where R is a chloro or ethoxy group, no amino-dechlorination or amino-deethoxylation was observed. 

The compounds 87a and 87b are aminated at position 4, yielding the 4-amino compound (88a, 40%) and the 2,4-diamino compound (88b, 11%) respectively the 2-ethoxy compound (87c), however, undergoes amination at position 4 as well at position 5, giving a mixture of the 4-amino compound (88c, 20%) and the 5-amino compound (89a, 14%).Tlie 2-chloro compound (87d) yields a highly complex reaction mixture from which the 5-amino compound (89b), the 2,4-diamino derivative (88b), and 2,5-diamino-l,8-naphthyridine (89c) could be isolated. l-Ethyl-3-nitro-l,8-naphthyridin-2(lH)-one (90a) and 3,6-dinitro-l-ethyl-l,8-naphthyridin-2(lH)-one (90b) were aminated exclusively in the 4-position to give compounds 91a (62%) and 91b (45%), respectively (93LA471). 

Catalytic hydrogenation (Pd/C) of 2-chloro-3-nitro-l,5-naphthyridine (125, R = Cl) in methanolic solution afforded 3-amino-l,5-naphthyridine (126, R = H, 74%) isolated in the form of its trihydrochloride (40MI1). Similar Pd/C hydrogenation of 2-ethoxy-3-nitro-l,5-naphthyridine (125, R = OEt) gave 3-amino-2-ethoxy-l,5-naphthyridine (126, R = OEt, 47%) (80RTC83). Reduction with tin(II) chloride in hydrochloric acid also leads to 126, (R = OEt, 73%) (63RTC997). 

X,X,X-Tetranitro-1 -Naphthol (4,X,X,X-Tetranitro-l-oxy-naphthalene). Yellow needles from ale, mp 215°. Prepn from 4-nitro-l-ethoxy naphthalene by nitration Ref Beil 6, 621... 

Acetic acid, nitro-, methyl ester, 55, 77, 78 Acetic acid, trifluoro-, 55 70 Acetonitrile, diphenyl-, 55, 94, 102 Acetonitrile, diphenyl-2-(l-ethoxyethenyl)-[ Acetonitrile, diphenyl-2-(l-ethoxy-vinyl)-, 55, 102... 

Ethoxy carbonylmethyl-l-methyl-2(lff)-quinoxalinone 4-oxide 3-Ethoxy carbonylmethyl-6/7-nitro-2(lff)-quinoxalinone... 

Ethoxy-3-methylquinoxaline 4-oxide 6-Ethoxy-8-nitro-2,3-diphenylquinoxaline 5 Ethoxy-7-nitroquinoxaline... 

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