The nitropolychlorobutadienes 3, 4 are valuable building blocks for various amination and successive heterocyclization products. Nucleophilic substitution reactions of the partially protected, bioactive amines 1, 2 with either vinyl, imidoyl or carbonyl chlorides result in the formation of the enamines 11, 12, 13, 16, 25, the amidine 6, and the amides 20, 21, respectively. In the following, cyclization to the highly functionalized pyrazoles 27, 28, pyrimidine 26 and pyridopyrimidine 24 succeeded. Deprotection of 21, 12 and 28 proved to be only partially feasible.
3,4-二
氯硝基
丁二烯是各种
氨基化和连续
杂环化合物的宝贵构建块。部分保护的
生物活性
胺类化合物1、2与
乙烯基、
亚胺基或羰基
氯反应,生成烯胺11、12、13、16、25、胺啉6以及酰胺20、21。随后,这些化合物成功地环化成高度官能化的
吡唑27、28、
嘧啶26和
吡啶嘧啶24。对21、12和28的去保护只能部分实现。