We describe the lithiation of the recently prepared 5,10-dimethyl-5,10-dihydrodipyrido[2,3-b:3,2-e] and [2,3-b:2,3-e]pyrazines 1 (R = CH3) and 2 (R = CH3), respectively. Interestingly while 1 was metallated at the pyridine ring, 2 was lithiated at the methyl groups. Reactions with electrophiles led to new functionalised dihydrodipyridopyrazines.
我们描述了最近制备的5,10-二甲基-5,10-二氢二
吡啶[2,3-b:3,2-e]和[2,3-b:2,3-e]
吡嗪1(R =
CH3)和2(R = )的
锂化过程。有趣的是,尽管1在
吡啶环上发生了
金属化,2却在甲基上发生了
锂化。与电亲体的反应导致了新的功能化二氢二
吡啶吡嗪的形成。