Pyrazine ketones

Note Reactions of the mixed-Claisen type afford a convenient route from pyrazinecarboxylic esters to some pyrazine ketones. 

Several major routes to pyrazine ketones have been covered already by primary synthesis in Chapters 1 and 2, by oxidation of aralkylpyrazines in Section 3.2.4.1, by oxidation of secondary hydroxyalkylpyrazines in Section 5.2.2, from pyrazinecarboxylic esters by the Claisen reaction in Section 8.2.2, from pyrazinecarbonyl halides (using several methods) in Section 8.3.2, and frompyrazinecarbonitriles with a Grignard (or similar reagent) in Section 8.6.2. 

Reactions of pyrazine ketones, that have been covered already, include reductive deoxygenation to alkylpyrazines (Section 3.2.1.5), reduction to extranuclear... 

Reactions of Pyrazine Ketones Pyrazine Cyanates, Isocyanates, Thiocyanates, Isothiocyanates, and Carbonitrile Oxides... 

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