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Synthesis of Quinoxalines from Various Fused Nitrogen-Containing Heterocycles Without a Pyrazine Fragment

Synthesis of Quinoxalines from Various Fused Nitrogen-Containing Heterocycles Without a Pyrazine Fragment [Pg.74]

1 From Benzofuroxan and Various Suppliers of the Two-Carbon C(2)-C(3) Fragment [Pg.74]

In 2011, Haddadin and coworkers reported that the Beirut reaction of a number of benzofurazan oxides 420 with 2-nitrobenzylcyanides 427 in acetonitrile with pyrrolidine as a catalyst, at room temperature, gave the corresponding 2-amino-3-(2-nitrophenyl)quinoxahne 1,4-dioxide 428. It was surprising to find out that the [Pg.74]

acetone, rt R = Me, Ph, P-CIC8H4, p-MeC8H4, P-F3CC6H4 R = OEt 10 examples,16-64% [Pg.75]

This easy formation of a series of 2-amino-3-(2-nitrophenyl)quinoxahnes 429a-c, g prompted the authors (Haddadin et al. 2011) to investigate their cyclization to the novel corresponding quioxalino[2,3-c]cinnoline 5-oxides 432a-d, h. Indeed, this type of cyclization to form cinnoline Af-oxides is well known (Haider and [Pg.76]



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Contain Nitrogen

Containers nitrogen

Fragmentation nitrogen

Fragmentation of heterocycles

From heterocycles

Fused heterocyclic

Fused nitrogen heterocycles

Heterocycles containing

Heterocycles fused

Heterocycles pyrazines

Heterocyclic nitrogen

Nitrogen heterocycles, synthesis

Nitrogen synthesis

Nitrogen-containing

Nitrogen-containing heterocycle synthesis

Nitrogen-containing heterocyclics

Of nitrogen-containing

Of nitrogen-containing heterocycles

Of pyrazine

Of pyrazines

Of quinoxalines

Pyrazines quinoxalines

Quinoxaline synthesis

Quinoxalines synthesis

Quinoxalines, synthesis from

Synthesis fragmentation

Synthesis of Quinoxalines

Synthesis of quinoxaline

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