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Nitropyrazines reactions

Like 2-aminopyridines and 2-aminopyrimidine, 2-aminopyrazine (39) (Scheme 29) has been converted into the nitroso compound (121) by reaction with dimethyl sulfide and NCS followed by deprotonation of the resulting sulfonium salt with sodium methoxide to the 5, 5-dimethylsulfilimine and then oxidation with MCPBA <82JOC552>. The extremely reactive nitrosopyrazine (121) condenses with 1,3-dienes to give 3,6-dihydro-1,2-oxazines and with aromatic amines in the presence of acid to gives azo compounds, and is smoothly oxidized with ozone or sodium hypochlorite to 2-nitropyrazine (122). Methyl 3-aminopyrazinecarboxylate reacts with thiophosgene to produce the... [Pg.261]

See other pages where Nitropyrazines reactions is mentioned: [Pg.253]    [Pg.261]    [Pg.237]    [Pg.261]   
See also in sourсe #XX -- [ Pg.261 ]

See also in sourсe #XX -- [ Pg.237 ]

See also in sourсe #XX -- [ Pg.261 ]



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