Aus den Pyrazinen (Ia) und (Ib) erhält man mit N‐Brom‐succinimid die Substitutionsprodukte (IIa) und (IIb), die durch Natrium‐2‐propan‐nitronat oder Pyridin‐1‐oxid zu den Ketonen (IIIa) und (IIIb) oxidiert werden.
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