The reductive metallation of 6-methyl-2,3-diphenylquinoxaline 1 with sodium metal in tetrahydrofuran and inert atmosphere to a monomeric dianion 2 has been explored and the nucleophilicity of this disodium adduct was investigated with various alkylation and acylation reagents. An annulation of the pyrazine ring system was accomplished by treating the dianion with polymethylene chlorides, Cl(CH₂)_nCl, n = 3,4.

中文翻译：

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6-甲基-2,3-二苯基喹喔啉的还原金属化。1,4-二氢-1,4-二嗪衍生物的合成

在四氢呋喃中和惰性气氛下，用钠金属将6-甲基-2,3-二苯基喹喔啉1还原金属化为单体二价阴离子2，并用各种烷基化和酰化试剂研究了该二钠加合物的亲核性。通过用聚氯乙烯Cl（CH ₂）_n Cl，n = 3,4处理二价阴离子完成吡嗪环系统的环化。