Transformations of tetrahydrobenzo[b][1,6]naphthyridines and tetrahydropyrido[4,3-b]pyrimidines under the action of dimethyl acetylene dicarboxylate
作者:Leonid G. Voskressensky、Tatiana N. Borisova、Innokenti S. Kostenev、Ilia V. Vorobiev、Alexey V. Varlamov
DOI:10.1016/j.tetlet.2005.02.001
日期:2005.3
6]naphthyridines 3, 4 undergo addition of DMAD, followed by a Stevens rearrangement of the intermediate ylide to yield methyl dioates 8 and 9. An alternative transformation sequence starts with migration of the dimethyl butenedioate anion to the carbon of the CN group, followed by the addition of 1 mol of water, to provide succinates 10 and 11. In contrast, tetrahydropyrido[4,3-b]pyrimidines 5–7 undergo a tandem
10 Cyanotetrahydrobenzo [ b ] [1,6]萘啶3,4进行加成DMAD,随后通过中间叶立德的史蒂文斯重排,得到甲基dioates 8和9。替代的转化顺序以丁烯二酸二甲酯的阴离子向CN基团的碳迁移开始,然后加入1摩尔水,以生成琥珀酸酯10和11。相反,四氢吡啶并[4,3- b ]嘧啶5 – 7经历一分子溶剂的串联裂解过程。生成的烯胺很容易被强酸裂解,得到二氢嘧啶基乙胺,而该胺几乎不能通过其他合成方法获得。