A new route to prepare pyridine derivatives based on inverse electron demand Diels–Alder/retro-Diels–Alder reactions of ketones with 1,2,4-triazines is reported. It is the first time using methyl ketones directly as a dienophile to react with 1,2,4-triazines without enamine intermediates, which is complementary to the classical Boger reaction.
报道了一种基于逆电子需求的酮与
1,2,4-三嗪的Diels-Alder / retro-Diels-Alder反应制备
吡啶衍生物的新途径。这是第一次直接将甲基酮作为亲二烯体与
1,2,4-三嗪反应,而没有烯胺中间体,这是对经典的Boger反应的补充。